FOCUS is a playable word

focus Scrabble® Dictionary

noun
pl. focuses or foci
a point at which rays converge or from which they diverge
verb
focused, focusing, focuses or focussed, focussing, focusses
to bring to a focus
9 Playable Words can be made from "FOCUS"
   2-Letter Words (4 found)
   3-Letter Words (4 found)
   5-Letter Words (1 found)