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List of 15-letter words containing

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There are 18 fifteen-letter words containing 2F, I, S and U

BUTTERFLYFISHESbutterflyfishes n. Plural of butterflyfish.
butterfly␣fishes n. Plural of butterfly fish.
BUTTERFLYFISH n. any tropical marine percoid fish of the genera Chaetodon, Chelmon, etc., that has a deep flattened brightly coloured or strikingly marked body.
DIFFUSIBILITIESdiffusibilities n. Plural of diffusibility.
DIFFUSIBILITY n. the state of being diffusible.
DIFFUSIVENESSESdiffusivenesses n. Plural of diffusiveness.
DIFFUSIVENESS n. the state of being diffusive.
EFFICACIOUSNESSefficaciousness n. Quality of being efficacious.
EFFICACIOUS n. having the power to produce a desired effect.
FLORIFEROUSNESSfloriferousness n. Quality of being floriferous, or bearing many flowers.
FLORIFEROUS n. bearing flowers.
FRIGHTFULNESSESfrightfulnesses n. Plural of frightfulness.
FRIGHTFULNESS n. the state of being frightful.
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.
INEFFECTUALNESSineffectualness n. Inefficacy.
INEFFECTUALNESS n. the state of being ineffectual.
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.
INSUFFICIENCIESinsufficiencies n. Plural of insufficiency.
INSUFFICIENCY n. the state of being insufficient, also INSUFFICIENCE.
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.
SUFFICINGNESSESSUFFICINGNESS n. the state of being sufficing.
SUPEREFFICIENCYsuperefficiency n. The quality of being superefficient.
SUPEREFFICIENCY n. the state of being superefficient.
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 WikWik.org and 1Word.ws.

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