backtalk vs sassing

backtalk and sassing both are nouns.

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

As nouns, backtalk and sassing are synonyms defined as:

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

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