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List of 15-letter words containing

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There are 19 fifteen-letter words containing E, 2F, I, N and O

DIFFERENTIATIONdifferentiation n. The act or process of differentiating (generally, without a specialized sense).
differentiation n. (Biology) The process by which the components of multicellular life (Cells, organs, etc.) are produced…
differentiation n. (Biology, evolution) The evolutionary process by which one taxonomic group (Species, genus, variety…
DIFFERENTIATORSdifferentiators n. Plural of differentiator.
DIFFERENTIATOR n. someone who or that which differentiates.
DISAFFECTIONATEdisaffectionate adj. Not disposed to affection; unfriendly.
DISAFFECTIONATE adj. showing disaffection.
DISAFFORESTMENTdisafforestment n. Disafforestation.
DISAFFORESTMENT n. the act of disafforesting.
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.
FRENCHIFICATIONFrenchification n. The act or process of making French or more French-like, especially in informal contexts.
Frenchification n. (Slang) Something that has undergone frenchification, something that has frenchified and made more French-like.
Frenchification n. Synonym of Gallicization, translation into French or a French translation.
INEFFICACIOUSLYinefficaciously adv. Without efficacy or effect.
INEFFICACIOUS adv. lacking the power to produce a desired effect.
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.
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.
OFFENSIVENESSESoffensivenesses n. Plural of offensiveness.
OFFENSIVENESS n. the state of being offensive.
OFFICIOUSNESSESofficiousnesses n. Plural of officiousness.
OFFICIOUSNESS n. OFFICIOUS, volunteering one's services too eagerly.
OVERFULFILLMENTSorry, definition not available.
REAFFORESTATIONreafforestation n. Reforestation.
REAFFORESTATION n. the act of reafforesting.
REFORTIFICATIONrefortification n. A second or subsequent fortification.
REFORTIFICATION n. the act of refortifying.
STANDOFFISHNESSstandoffishness n. The state, quality, or condition of being standoffish or aloof and unsociable; aloofness.
stand-offishness n. Alternative spelling of standoffishness.
STANDOFFISHNESS n. the state of being standoffish.
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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