Synonyms of understudy

1 Syllable
thesp, dh, sub
2 Syllables
stand-by, thespians, fill-in, ingénue, standby, actor, locum, double, stand-in, backup, thespian, actors
3 Syllables
play-actor, orderlies, hambone, changeling, pinch-hitter, benchwarmer, benchwarmers, supplanter, reserve, successor
4 Syllables
alternate, temporaries, ventriloquist, succedaneum, replacement