15 Letter Words That Start With 'O'

Find all the 15-letter words in the English language that start with O.

There are 27 15-letter words that begin with O.
There are 0 15-letter abbreviations that begin with O.
There are 55 15-letter phrases that begin with O.
View All Words That Start With O

15 Letter Words That Start With 'O'

Words
Objectification31 Observationally23 Obstructiveness22 Oligodendrocyte23 Oligodendroglia19 Oligosaccharide24 Omnidirectional20 One-thirty-second24 Ophthalmologist26 Ophthalmoplegia28 Opisthognathous24 Opisthorchiasis25 Organophosphate26 Overachievement28 Overbearingness21 Overcommitments26 Overcomplicated27 Over-embellished26 Overfamiliarity26 Overgeneralised20 Overincredulous21 Overrepresented21 Oversensitivity24 Oversimplifying29 Overutilisation18 Overutilization27 Oxyphenbutazone41
Phrases
Object Of The Verb Oblique Triangle Observation Dome Observation Post Obstetrical Toad Occipital Cortex Ocellated Turkey Octanedioic Acid Oculomotor Nerve Odd-toed Ungulate Odontoid Process Office Furniture Ohmic Resistance Oil Conservation Oil Of Turpentine Old-age Insurance Old-age Pensioner Oligochaete Worm Olive-tree Agaric Omega-3 Fatty Acid Omega-6 Fatty Acid On A Regular Basis One After Another One Hundred Fifty One Hundred Forty One Hundred Sixty One-way Light Time Operating Budget Operating System Operational Cell Opportunity Cost Optical Illusion Oral Examination Oral Personality Orange Marmalade Orbital Rotation Orchestral Bells Orderly Sergeant Order Of Business Ordinary Annuity Ordinary Bicycle Organic Compound Organic Disorder Organization Man Organ Transplant Osmotic Pressure Os Tarsi Fibulare Outside Marriage Oven Thermometer Overdraft Credit Overhead Railway Overthrust Fault Ovulation Method Oxaloacetic Acid Oxidation Number
Words That Start With
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