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There are 19 twelve-letter words containing F, I, L, N, O, R, S and U

CALIFORNIUMSCALIFORNIUM n. a synthetic element produced in trace quantities by helium isotope bombardment of curium.
COUNTERFOILScounterfoils n. Plural of counterfoil.
COUNTERFOIL n. part of ticket or cheque retained by giver.
FLUORESCEINEfluoresceine n. Alternative spelling of fluorescein.
FLUORESCEINE n. a fluorescent dyestuff, also FLUORESCEIN.
FLUORESCEINSfluoresceins n. Plural of fluorescein.
FLUORESCEIN n. a fluorescent dyestuff, also FLUORESCEINE.
FLUORIDISINGfluoridising v. Present participle of fluoridise.
FLUORIDISE v. to add fluoride to drinking water, also FLUORIDIZE.
FLUSTRATIONSFLUSTRATION n. (obsolete) flustering.
FORMULATIONSformulations n. Plural of formulation.
FORMULATION n. an act or the product of formulating.
FULGURATIONSfulgurations n. Plural of fulguration.
FULGURATION n. the act of flashing like lightning.
FURUNCULOSISfurunculosis n. (Medicine) The presence of furuncles or boils.
FURUNCULOSIS n. an affliction of boils.
GLANDIFEROUSglandiferous adj. Bearing acorns or other nuts.
GLANDIFEROUS adj. bearing acorns or nuts.
GRISEOFULVINgriseofulvin n. (Pharmacology) An antifungal drug C17H17ClO6 obtained from the mold Penicillium griseofulvum, used in…
GRISEOFULVIN n. an oral antibiotic used as a treatment for fungal infections of the skin and hair.
INSUFFLATORSinsufflators n. Plural of insufflator.
INSUFFLATOR n. one who insufflates.
LUMINIFEROUSluminiferous adj. Producing or transmitting light; luminous.
LUMINIFEROUS adj. bearing or bringing light.
NEUROFIBRILSneurofibrils n. Plural of neurofibril.
NEUROFIBRIL n. one of a large number of fine fibres present in the cytoplasm of a nerve cell.
NONFRIVOLOUSnonfrivolous adj. (Law) Not frivolous.
NONFRIVOLOUS adj. not frivolous.
SELENIFEROUSseleniferous adj. (Chemistry) containing, or yielding selenium.
SELENIFEROUS adj. containing or yielding selenium.
SULFURATIONSsulfurations n. Plural of sulfuration.
SULFURATION n. the process of treating with sulfur, also SULPHURATION.
UNFORMALISEDunformalised adj. Alternative form of unformalized.
UNFORMALISED adj. not formalised, also UNFORMALIZED.
UNWORSHIPFULunworshipful adj. Not worshipful.
UNWORSHIPFUL adj. not worshipful.

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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See this list for:

  • English Wiktionary: 76 words
  • Scrabble in French: 73 words
  • Scrabble in Spanish: 21 words
  • Scrabble in Italian: 24 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 71 words


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