sassing vs lip

sassing and lip both are nouns.

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

As nouns, sassing and lip are synonyms defined as:

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

sassing (noun)	lip (noun)
an impudent or insolent rejoinder	either the outer margin or the inner margin of the aperture of a gastropod's shell
	the top edge of a vessel or other container
	either of two fleshy folds of tissue that surround the mouth and play a role in speaking
	an impudent or insolent rejoinder
	(botany) either of the two parts of a bilabiate corolla or calyx