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List of 15-letter words containing

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There are 17 fifteen-letter words containing 2F, 2I and 2S

DIFFRACTIVENESSDIFFRACTIVE n. causing diffraction.
DIFFUSIBILITIESdiffusibilities n. Plural of diffusibility.
DIFFUSIBILITY n. the state of being diffusible.
DIFFUSIVENESSESdiffusivenesses n. Plural of diffusiveness.
DIFFUSIVENESS n. the state of being diffusive.
DISAFFILIATIONSdisaffiliations n. Plural of disaffiliation.
DISAFFILIATION n. the act of disaffiliating.
DISAFFIRMATIONSdisaffirmations n. Plural of disaffirmation.
DISAFFIRMATION n. the act of disaffirming.
EFFICACIOUSNESSefficaciousness n. Quality of being efficacious.
EFFICACIOUS n. having the power to produce a desired effect.
FORISFAMILIATESforisfamiliates v. Third-person singular simple present indicative form of forisfamiliate.
FORISFAMILIATE v. (Scots) to emancipate from parental authority.
INDIFFERENTISMSindifferentisms n. Plural of indifferentism.
INDIFFERENTISM n. the belief that all religions are equally valid.
INDIFFERENTISTSindifferentists n. Plural of indifferentist.
INDIFFERENTIST n. an exponent of indifferentism.
INEFFECTIVENESSineffectiveness n. The condition of being ineffective.
INEFFECTIVENESS n. the state of being ineffective.
INOFFENSIVENESSinoffensiveness n. The state or condition of being inoffensive.
INOFFENSIVE n. causing no harm or injury, also UNOFFENSIVE.
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.
OFFICIOUSNESSESofficiousnesses n. Plural of officiousness.
OFFICIOUSNESS n. OFFICIOUS, volunteering one's services too eagerly.
SUFFICINGNESSESSUFFICINGNESS n. the state of being sufficing.
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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