sassing vs backtalk

sassing and backtalk both are nouns.

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

As nouns, sassing and backtalk are synonyms defined as:

Other synonyms of sassing include back talk, lip, mouth, sass.

sassing (noun)	backtalk (noun)
an impudent or insolent rejoinder	an impudent or insolent rejoinder