GABBRO is a playable word

gabbro Scrabble® Dictionary

noun
pl. gabbros
a type of rock
(adjective) gabbroic, gabbroid
37 Playable Words can be made from "GABBRO"
   2-Letter Words (7 found)
   3-Letter Words (22 found)
   4-Letter Words (7 found)
   6-Letter Words (1 found)