labial vs lip

labial and lip both are nouns.

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

labial (noun)	lip (noun)
a consonant whose articulation involves movement of the lips	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

labial (adjective)	lip (adjective)
relating to or near the female labium
of or relating to the lips of the mouth