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8-letter words (1 found)
EFFICACY,
4-letter words (11 found)
AFFY,CAFE,CAFF,CECA,FACE,FICE,FIEF,FIFE,FYCE,IFFY,YAFF,
3-letter words (15 found)
ACE,AFF,AYE,CAF,CAY,EFF,FAE,FAY,FEY,FIE,ICE,ICY,IFF,YAE,YEA,
2-letter words (11 found)
AE,AI,AY,EA,EF,FA,FE,FY,IF,YA,YE,
1-letter words (1 found)
E,
You can make 39 words from efficacy according to the Scrabble US and Canada dictionary.