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 There are 4 thirteen-letter words containing A, F, H, M, N and U| HARMFULNESSES | • harmfulnesses n. Plural of harmfulness. • HARMFULNESS n. the state of being harmful.
 |  | HUMIFICATIONS | • humifications n. Plural of humification. • HUMIFICATION n. formation of or conversion into humus.
 |  | SULFONMETHANE | • sulfonmethane n. (Organic chemistry) A sedative drug with chemical formula C7H16O4S2; acetone diethyl sulfone. • SULFONMETHANE n. (US) a colourless crystalline compound used medicinally as a hypnotic, also SULPHONMETHANE.
 |  | VOUCHSAFEMENT | • vouchsafement n. The act of vouchsafing. • vouchsafement n. That which is vouchsafed; a gift or grant in condescension.
 • VOUCHSAFEMENT n. the act of vouchsafing.
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 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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