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There are 48 twenty-one-letter words containing F, L, 3R and U

arylsulfotransferasesarylsulphotransferaseblue-breasted␣fairywrenbromotrifluoromethanecerebrofacioarticularchlorotetrahydrofurancountertransferentialdifferential␣structureferroelectric␣shuttersfreshwater␣pearl␣musselfructosyltransferasesglucoronyltransferaseglucuronyltransferasehairy-eared␣dwarf␣lemurshydroheterofullereneshydroxymethylfurfuralimmunoelectrotransferinferior␣petrosal␣sinusletter␣of␣countermarquelong␣run␣for␣a␣short␣slideMediterranean␣fruit␣flymicrofluorimetricallymicrofluorocytometersminiature␣scarlet␣fevernatural␣transformationnatural␣user␣interfacesnonchlorofluorocarbonplexiform␣neurofibromaprincipal␣ultrafilterspurple-backed␣fairywrenquadrature␣of␣the␣circlerare␣as␣a␣four-leaf␣cloverrear␣admirals␣(upper␣half)reduced␣row␣echelon␣formrepresentable␣functorsRepublic␣of␣Sierra␣LeoneRockefeller␣Republicanrufous-collared␣sparrowSalter-Harris␣fracturesschool␣resource␣officersurface␣boundary␣layerstetrabromofluoresceintetrafluoroberyllatestetratrifluoroacetatetransformational␣rulesultramicrofluorimetryurea-formaldehyde␣resinwardrobe␣malfunctioner

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 67 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: 5 words
  • German Wiktionary: 56 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 13 words

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