GNOMON is a playable word

gnomon Scrabble® Dictionary

noun
pl. gnomons
a part of a sundial
(adjective) gnomonic
19 Playable Words can be made from "GNOMON"
   2-Letter Words (5 found)
   3-Letter Words (8 found)
   4-Letter Words (4 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)