TRACTRIX is a playable word

tractrix Scrabble® Dictionary

noun
pl. tractrices
a mathematical curve
40 Playable Words can be made from "TRACTRIX"
   2-Letter Words (8 found)
   3-Letter Words (18 found)
   4-Letter Words (8 found)
   5-Letter Words (5 found)
   8-Letter Words (1 found)