PREFIX 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)
33 Playable Words can be made from "PREFIX"
   2-Letter Words (9 found)
   3-Letter Words (14 found)
   4-Letter Words (7 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)