TARDYON is a playable word

tardyon Scrabble® Dictionary

noun
pl. tardyons
a subatomic particle that travels slower than the speed of light
112 Playable Words can be made from "TARDYON"
   2-Letter Words (17 found)
   5-Letter Words (13 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)