SUBSOIL is a playable word

subsoil Scrabble® Dictionary

verb
subsoiled, subsoiling, subsoils
to plow so as to turn up the subsoil (the layer of earth beneath the surface soil)
58 Playable Words can be made from "SUBSOIL"
   2-Letter Words (10 found)
   3-Letter Words (17 found)
   5-Letter Words (10 found)
   7-Letter Words (1 found)