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There are 17 twelve-letter words containing A, B, F, I, N, O and U

BIFUNCTIONALbifunctional adj. Having two functions.
bifunctional adj. (Chemistry, of a compound) Having two functional groups or binding sites.
bifunctional adj. (Chemistry, of a reaction) Involving two functional groups or binding sites.
BIFURCATIONSbifurcations n. Plural of bifurcation.
BIFURCATION n. the state of being bifurcated.
DIBENZOFURANdibenzofuran n. (Organic chemistry) The tricyclic heterocycle in which two benzene rings are fused to that of furan;…
DIBENZOFURAN n. a highly toxic chemical compound that is used in chemical synthesis and as an insecticide.
INFIBULATIONinfibulation n. An act of fastening, especially the stitching together of the labia to prevent intercourse.
INFIBULATION n. the act of fastening with ring, clasp or stitches to prevent sexual intercourse.
NEUROFIBROMAneurofibroma n. (Medicine) A benign tumor composed of fibroblasts surrounding nerve cells.
NEUROFIBROMA n. a tumour of the nervous fibre.
OBFUSCATIONSobfuscations n. Plural of obfuscation.
OBFUSCATION n. the act of obfuscating.
RUBEFACTIONSrubefactions n. Plural of rubefaction.
RUBEFACTION n. reddening.
SUBFEUDATIONsubfeudation n. Alternative form of subinfeudation.
SUBFEUDATION n. subinfeudation.
SUBMANIFOLDSsubmanifolds n. Plural of submanifold.
SUBMANIFOLD n. in mathematics, a subset of a manifold which itself has the properties of a manifold.
SURFBOARDINGsurfboarding v. Present participle of surfboard.
SURFBOARDING n. the sport of surfing on a surfboard.
UNCONFINABLEunconfinable adj. That cannot be confined.
UNCONFINABLE adj. not confinable.
UNFORGIVABLEunforgivable adj. Not forgivable; inexcusable.
UNFORGIVABLE adj. not forgivable.
UNFORGIVABLYunforgivably adv. In an unforgivable manner.
UNFORGIVABLE adv. not forgivable.
UNFORMIDABLEunformidable adj. Not formidable.
UNFORMIDABLE adj. not formidable.
UNMODIFIABLEunmodifiable adj. Incapable of being modified; immune to modification.
UNMODIFIABLE adj. not modifiable.
UNPROFITABLEunprofitable adj. Not making a profit.
UNPROFITABLE adj. not profitable.
UNPROFITABLYunprofitably adv. In an unprofitable manner.
UNPROFITABLE adv. not profitable.

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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