15-Letter Words Containing: E,E,F,F,O,S

• A device that uses diffraction (especially X-ray diffraction) to investigate the structure of matter.

• capacity or power to produce a desired effect

• the quality of being offensive

• the quality of requiring deliberate effort

• aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation

• tendency to forget

• unawareness caused by neglectful or heedless failure to remember