SUBFIXES is a playable word

subfix Scrabble® Dictionary

noun
pl. subfixes
a distinguishing symbol or letter written below another character
59 Playable Words can be made from "SUBFIXES"
   2-Letter Words (12 found)
   3-Letter Words (22 found)
   4-Letter Words (15 found)
   5-Letter Words (7 found)
   6-Letter Words (2 found)
   8-Letter Words (1 found)