PREFIXES is a playable word

prefix Scrabble® Dictionary

verb
prefixed, prefixing, prefixes
to add as a prefix (a form affixed to the beginning of a root word)
124 Playable Words can be made from "PREFIXES"
   2-Letter Words (12 found)
   6-Letter Words (7 found)
   7-Letter Words (3 found)
   8-Letter Words (1 found)