Nouns

(n)joke, gag, laugh, jest, japea humorous anecdote or remark intended to provoke laughter“he told a very funny joke”, “he knows a million gags”, “thanks for the laugh”, “he laughed unpleasantly at his own jest”, “even a schoolboy's jape is supposed to have some ascertainable point”
(n)gag, muzzlerestraint put into a person's mouth to prevent speaking or shouting

Verbs

(v)gag, muzzleprevent from speaking out“The press was gagged”
(v)choke, gag, fretbe too tight; rub or press“This neckband is choking the cat”
(v)gag, muzzletie a gag around someone's mouth in order to silence them“The burglars gagged the home owner and tied him to a chair”
(v)gag, quipmake jokes or quips“The students were gagging during dinner”
(v)gag, choke, strangle, suffocatestruggle for breath; have insufficient oxygen intake“he swallowed a fishbone and gagged”
(v)gag, chokecause to retch or choke
(v)gag, heave, retchmake an unsuccessful effort to vomit; strain to vomit