rejoinder vs sass

rejoinder and sass both are nouns.

Word	Noun	Adjective	Verb	Adverb
rejoinder	Yes	No	No	No
sass	Yes	No	Yes	No

As nouns, sass is a hyponym of rejoinder; that is, sass is a word with a more specific, narrower meaning than rejoinder:

rejoinder: a quick reply to a question or remark (especially a witty or critical one)
sass: an impudent or insolent rejoinder

Other hyponyms of rejoinder include back talk, backtalk, lip, mouth, sassing.

rejoinder (noun)	sass (noun)
a quick reply to a question or remark (especially a witty or critical one)	an impudent or insolent rejoinder
(law) a pleading made by a defendant in response to the plaintiff's replication

rejoinder (verb)	sass (verb)
	answer back in an impudent or insolent manner