rejoinder vs sassing

rejoinder and sassing both are nouns.

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

As nouns, sassing is a hyponym of rejoinder; that is, sassing 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)
sassing: an impudent or insolent rejoinder

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

rejoinder (noun)	sassing (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