PROLOG is a playable word

prolog Scrabble® Dictionary

verb
prologed, prologing, prologs
to prologue
28 Playable Words can be made from "PROLOG"
   2-Letter Words (5 found)
   3-Letter Words (10 found)
   4-Letter Words (10 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)