RHEOBASES is a playable word

rheobase Scrabble® Dictionary

noun
pl. rheobases
the smallest amount of electricity required to stimulate a nerve
280 Playable Words can be made from "RHEOBASES"
   2-Letter Words (21 found)
   7-Letter Words (8 found)
   8-Letter Words (4 found)
   9-Letter Words (1 found)