roar
vb
1 bawl, bay, bell, bellow, clamour, crash, cry, howl, rumble, shout, thunder, vociferate, yell
2 bust a gut (informal) crack up (informal) guffaw, hoot, laugh heartily, split one's sides (informal)
n
3 bellow, clamour, crash, cry, howl, outcry, rumble, shout, thunder, yell
4 belly laugh (informal) guffaw, hoot