Same word as shoutest:

amusement, babbling, bubbling, burbling, cachinnation, cackle, chortle, chuckle, chuckling, crack-up, crow, fit, gesture, giggle, giggling, glee, guffaw, hilarity, howling, merriment, mirth, peal, rejoicing, rippling, roar, shout, shriek, snicker, snigge