Gabbroic rhymes with:
dichroic, heroic, bowick, cenozoic, dichroic, heroic, mesozoic, paleozoic, slowik, stoic
Gabbroic sounds like:
gabrys, gavras, gavras's, geoffrey's, gibberish, giuffre's, givers, gooseberries, gophers, gossipers, guevara's, guggisberg