Roars, noun plural of roar. Synonyms in the same form.
Shout
shouts, screams, bellowings, bellows, yells, calls, yowls, hollers, hollerings, bawls, outcries, hollos, holloas, clamors, exclaims, hoots, squalls, halloos
Thunder
thunders, booms
Other
laughs, grumbles, blusters, brawls, peals, ruts, fulminates
All synonyms for roar →