gag vs quip

gag and quip both are nouns.

Word	Noun	Adjective	Verb	Adverb
gag	Yes	No	Yes	No
quip	Yes	No	Yes	No

As verbs, gag and quip are synonyms defined as:

gag (noun)	quip (noun)
restraint put into a person's mouth to prevent speaking or shouting	witty remark
a humorous anecdote or remark intended to provoke laughter	a witty saying

gag (verb)	quip (verb)
struggle for breath; have insufficient oxygen intake	make jokes or quips
make an unsuccessful effort to vomit; strain to vomit
cause to retch or choke
make jokes or quips
be too tight; rub or press
tie a gag around someone's mouth in order to silence them
prevent from speaking out