OPERON is a playable word

operon Scrabble® Dictionary

noun
pl. operons
a type of gene cluster
40 Playable Words can be made from "OPERON"
   2-Letter Words (11 found)
   3-Letter Words (15 found)
   4-Letter Words (11 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)