12 Letter Words That Start With 'A'

Abbreviating20 Abbreviation19 Abolitionary17 Abolitionism16 Abolitionist14 Abominations16 Abortionists14 Abrasiveness17 Absentminded18 Absoluteness14 Absolutistic16 Absorptivity22 Absquatulate23 Abstemiously19 Abstractedly20 Abstractions16 Abstractness16 Abstruseness14 Academically22 Academicians19 Acantholysis20 Accelerating17 Acceleration16 Accelerative19 Accelerators16 Acceleratory19 Accentuating17 Accentuation16 Acciaccatura20 Accidentally20 Acclamations18 Acclimatised19 Accommodated22 Accommodates21 Accommodator21 Accompanying24 Accompanyist23 Accomplished24 Accomplishes23 Accordionist17 Accouchement23 Accouterment18 Accoutrement18 Accretionary19 Accumulating19 Accumulation18 Accumulative21 Accumulators18 Accusatorial16 Acetaldehyde22 Achievements22 Achlamydeous23 Achlorhydria24 Achlorhydric26 Achromatinic21 Acidophilous20 Acknowledged24 Acknowledges23 Acoustically19 Acquaintance25 Acquiescence27 Acquisitions23 Acrocyanosis19 Acromyotonia19 Actinometric18 Actinomycete21 Acylglycerol23 Adaptability20 Adaptational15 Additionally17 Addlebrained17 Adequateness22 Adhesiveness19 Adjectivally28 Adjudicating24 Adjudication23 Adjudicative26 Adjudicators23 Adjudicatory26 Administered16 Administrate15 Admirability20 Admonishment20 Adorableness15 Adscititious15 Adulterating14 Adulteration13 Adulteresses13 Adulterously16 Advancements20 Advantageous17 Adventitious16 Advisability21 Aerodynamics20 Aeroembolism18 Aeromechanic21 Aeromedicine17 Aeronautical14 Aesthetician17 Aestheticism19 Aetiological15 Affectations20 Affectedness21 Affectionate20 Affiliations18 Affirmations20 Afghanistani19 Aforethought22 Afro-American19 Aftereffects23 Aftershafted22 Afterthought22 Agamogenesis16 Agamogenetic18 Agent-in-place17 Agglomerated17 Agglomerator16 Agglutinogen15 Aggravations17 Aggregations15 Aggressively20 Agreeability18 Agribusiness15 Agricultural15 Agrobiologic18 Agrochemical22 Ailurophobia19 Air-breathing18 Air-condition15 Aircraftsman19 Air-to-surface17 Alcaptonuria16 Algarrobilla15 Algometrical17 Alimentation14 Alimentative17 Alkaptonuria18 Alkylbenzene30 All-devouring17 All-embracing19 Alleviations15 All-important16 All-inclusive17 Alliterating13 Alliteration12 Alliterative15 Alloantibody18 All-or-nothing16 Allotropical16 Allusiveness15 Almond-shaped21 Al-Muhajiroun24 Alphabetical21 Alphabetised20 Alphabetiser19 Alphabetized29 Alphabetizer28 Alpha-blocker25 Alphamerical21 Alphanumeric21 Alstroemeria14 Alterability17 Altercations14 Alternations12 Alternatives15 Altitudinous13 Amalgamating18 Amalgamation17 Amalgamative20 Amateurishly20 Ambassadress17 Ambidextrous24 Ambitionless16 Ambivalently22 Ameliorating15 Amelioration14 Ameliorative17 Amelioratory17 Amelogenesis15 Amenableness16 Amenorrhoeal17 Amenorrhoeic19 Amentiferous17 Amethopterin19 Amicableness18 Aminomethane19 Aminopherase19 Amortisation14 Amortization23 Ampere-minute18 Ampere-second19 Amphetamines21 Amphidiploid23 Amphitheater22 Amphitheatre22 Amphitropous21 Amphotericin21 Amygdaliform24 Amygdaloidal20 Amygdalotomy24 Anachronisms19 Anaerobiotic16 Anaesthetics17 Anaesthetise15 Anaesthetist15 Anaesthetize24 Anaglyphical23 Anaglyptical20 Anagrammatic19 Analphabetic21 Analytically20 Anamorphosis19 Anaphrodisia18 Anaphylactic24 Anaplasmosis16 Anarchically22 Anastigmatic17 Anathematise17 Anathematize26 Anatomically19 Anchorperson19 Androgenesis14 Androgenetic16 Androglossia14 Androsterone13 Anemographic22 Anemophilous19 Anencephalia19 Anencephalic21 Aneurismatic16 Aneurysmatic19 Angiocarpous17 Angiogenesis14 Angiosarcoma17 Animatronics16 Anise-scented15 Anisogametic17 Anisotropies14 Ankylosaurus19 Annexational19 Annihilating16 Annihilation15 Annihilative18 Announcement16 Annunciation14 Annunciatory17 Anorexigenic22 Antagonising14 Antagonistic15 Antecedently18 Antediluvial16 Antediluvian16 Antemeridian15 Anthelmintic19 Anthologised17 Anthophagous21 Anthophilous20 Anthropogeny21 Anthropoidal18 Anthropology21 Antiaircraft17 Antialiasing13 Anti-American16 Anticatalyst17 Anticipating17 Anticipation16 Anticipative19 Anticipatory19 Anticyclonic21 Antidiabetic17 Antidiuretic15 Antielectron14 Antifeminism19 Antifeminist17 Antiknocking23 Antimacassar16 Antimagnetic17 Antimalarial14 Antimicrobic20 Antimonopoly19 Antineutrino12 Antioxidants20 Antiparallel14 Antiparticle16 Antipathetic19 Antipruritic16 Antiquarians21 Anti-Semitism16 Antisemitism16 Antistrophic19 Antisymmetry22 Antithetical17 Aphrodisiacs20 Apiculturist16 Aplacophoran21 Apochromatic23 Apocynaceous21 Apostrophise19 Apostrophize28 Apothecaries19 Apothegmatic22 Apparatchiks25 Apparentness16 Apparitional16 Appellations16 Appendectomy24 Appendicitis19 Appendicular19 Apperception20 Apperceptive23 Appertaining17 Apple-scented19 Applications18 Appoggiatura18 Appointments18 Apportioning17 Appositeness16 Appositional16 Appositively22 Appraisingly20 Appreciating19 Appreciation18 Appreciative21 Apprehending21 Apprehension19 Apprehensive22 Approachable23 Appropriable20 Appropriated19 Appropriates18 Appropriator18 Approximated26 Approximates25 Appurtenance18 Aquacultural23 Aquicultural23 Arbitrageurs15 Arbitrations14 Arccotangent17 Archaeologic20 Archdeaconry23 Archdiocesan20 Archegoniate18 Archeologist18 Archeopteryx29 Archesporial19 Archesporium21 Archetypical24 Archiannelid18 Archipallium21 Archipelagic22 Architecture19 Architeuthis20 Archosaurian17 Argillaceous15 Aristocratic16 Aristotelean12 Aristotelian12 Arithmetical19 Armourplated17 Armour-plated17 Aromatherapy22 Arraignments15 Arrangements15 Arrhythmical25 Arsenopyrite17 Arthrography24 Arthroplasty20 Arthropodous18 Arthrosporic19 Articulately17 Articulating15 Articulation14 Articulative17 Articulatory17 Artificially20 Artilleryman17 Artistically17 Artsy-craftsy23 Ascertaining15 Ascomycetous21 Asparaginase15 Asphyxiating28 Asphyxiation27 Aspirational14 Assassinated13 Assassinator12 Asseveration15 Assibilation14 Assignations13 Assimilating15 Assimilation14 Assimilative17 Assimilatory17 Associations14 Astonishment17 Astoundingly17 Astrobiology18 Astrological15 Astronautics14 Astronomical16 Astrophysics22 Asymmetrical21 Asymptomatic23 Asynchronism22 Asynchronous20 Atheromatous17 Athletically20 Atmospherics21 Atorvastatin15 Attitudinise13 Attitudinize22 Attorneyship20 Attractively20 Attributable16 Attributions14 Audio-lingual14 Augmentation15 Augmentative18 Auscultation14 Auscultatory17 Auspiciously19 Australasian12 Austronesian12 Authenticate17 Authenticity20 Autoantibody18 Autochthonal20 Autochthonic22 Autodidactic18 Autographing19 Autoignition13 Autoimmunity19 Autoinjector21 Auto-mechanic21 Automobilist16 Automorphism21 Autonomously17 Autosemantic16 Availability20 Avariciously20 Avifaunistic20 Avitaminosis17 Avitaminotic19 Award-winning20 Awe-inspiring18 Axiomatising22 Azadirachtin27 Azathioprine26 Azithromycin31 Abelian Group Ablative Case Abortion Pill Above The Salt Absentee Rate Absolute Zero Abutment Arch Academic Gown Academic Robe Academic Term Academic Year Acaroid Resin Accroides Gum Accrual Basis Ace In The Hole Acetate Rayon Acid Hydrogen Acne Vulgaris Acoustic Buoy Acoustic Wave Acrylic Fiber Acrylic Paint Acrylic Resin Action Replay Adder's Tongue Adenylic Acid Adhesive Tape Adipose Tumor Adjutant Bird Admiralty Law Admission Fee Adrenal Gland Ad Valorem Tax Aerial Ladder Affected Role Afternoon Tea After The Fact Agamid Lizard Agentive Role Age Of Consent Air Pollution Air Transport Air Traveller Alcohol Abuse Alcohol Group Alethic Logic Aliquant Part Alizarine Red Alkane Series Alkyl Radical All-day Sucker All Important All Of A Sudden All-or-none Law Allspice Tree Alluvial Cone Alluvial Flat Alluvial Soil Allyl Alcohol Allyl Radical Almond Cookie Almond Willow Alphabet Soup Alpha Blocker Alpine Azalea Alpine Clover Alpine Hulsea Alpine Totara Aluminum Foil Alveolar Arch American Plan Amicus Curiae Amino Plastic Ammonia Clock Ammonia Water Ammonium Alum Anadama Bread Anchovy Paste Anchovy Pizza Anchovy Sauce Ancien Regime Anemic Anoxia Angiotensin I Angle Bracket Angled Loofah Angstrom Unit Anguid Lizard Angular Shape Animal Nature Animal Starch Animal Tissue Animate Being Animate Thing Anonymous Ftp Anoxic Anoxia Ante Meridiem Anterior Horn Anterior Root Antitrust Law Any-and-all Bid Aortic Plexus Apparel Chain Appeals Board Appeals Court Apple Fritter Apple Orchard Approach Path Approach Shot Apricot Sauce Aquatic Plant Aqueous Humor Arc Cotangent Arctic Willow Arcus Senilis Arena Theater Armed Robbery Armed Service Armored Scale Armor Plating Arms Industry Army Engineer Arrester Hook Arroyo Willow Arsenic Group Arteria Ileum Arterial Road Artesian Well Art Historian Artisan's Lien Artist's Model As A Formality Ascorbic Acid Asparagus Bed Asparagus Pea Aspartic Acid Assault Rifle Assembly Hall Assembly Line Astatic Coils Asteroid Belt Asthenic Type Asthma Attack At Any Expense At Arm's Length Ataxic Abasia At Close Range At First Blush At First Sight Athlete's Foot Athletic Game Athletic Sock Athletic Type Athletic Wear Atomic Energy Atomic Number Atomic Theory Atomic Weapon Atomic Weight Atopic Eczema Atrial Artery Atrium Cordis Attar Of Roses Auction Block Auction House Auction Pitch Auditory Area Auditory Tube Audit Program Auld Langsyne Automatic Gun Autumn Crocus Axillary Node Axillary Vein Axis Vertebra Azido Radical