respond vs sass

respond is not a noun while sass is a noun.

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

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

Other hyponyms of respond include call back, counter, field, come back, rejoin, repay, retort, return, riposte, bridle.

respond (noun)	sass (noun)
	an impudent or insolent rejoinder

respond (verb)	sass (verb)
show a response or a reaction to something	answer back in an impudent or insolent manner
respond favorably or as hoped
react verbally