FUNCTION is a playable word

function Scrabble® Dictionary

verb
functioned, functioning, functions
to be in action
74 Playable Words can be made from "FUNCTION"
   2-Letter Words (12 found)
   3-Letter Words (22 found)
   5-Letter Words (12 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)