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List of 15-letter words containing

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There are 12 fifteen-letter words containing 2F, O, S and U

EFFICACIOUSNESSefficaciousness n. Quality of being efficacious.
EFFICACIOUS n. having the power to produce a desired effect.
EFFORTFULNESSESEFFORTFULNESS n. EFFORTFUL, requiring effort.
FLORIFEROUSNESSfloriferousness n. Quality of being floriferous, or bearing many flowers.
FLORIFEROUS n. bearing flowers.
FORGETFULNESSESforgetfulnesses n. Plural of forgetfulness.
FORGETFULNESS n. the state of being forgetful.
FRUCTIFICATIONSfructifications n. Plural of fructification.
FRUCTIFICATION n. the reproductive organs or fruit of a plant.
IMMUNODIFFUSIONimmunodiffusion n. A technique used to detect the reaction between an antigen and an antibody by observing the behavior…
IMMUNODIFFUSION n. any of various analytical techniques that involve antigen and antibody solutions diffusing toward each other in a gel until antibody binds specifically to antigen to form a precipitate.
INEFFICACIOUSLYinefficaciously adv. Without efficacy or effect.
INEFFICACIOUS adv. lacking the power to produce a desired effect.
INOFFICIOUSNESSinofficiousness n. The quality of being inofficious.
INOFFICIOUS n. not officious.
INTERDIFFUSIONSinterdiffusions n. Plural of interdiffusion.
INTERDIFFUSION n. the process of diffusing and mixing freely so as to approach a homogeneous mixture.
NONFULFILLMENTSnonfulfillments n. Plural of nonfulfillment.
NONFULFILLMENT n. something that is not fulfillment, also NONFULFILMENT.
OFFICIOUSNESSESofficiousnesses n. Plural of officiousness.
OFFICIOUSNESS n. OFFICIOUS, volunteering one's services too eagerly.
UNFOSSILIFEROUSunfossiliferous adj. Not fossiliferous, nonfossiliferous.
UNFOSSILIFEROUS adj. not fossiliferous.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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