overlip vs lip

overlip and lip both are nouns.

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

As nouns, lip is a hypernym of overlip; that is, lip is a word with a broader meaning than overlip:

overlip: the upper lip
lip: either of two fleshy folds of tissue that surround the mouth and play a role in speaking

overlip (noun)	lip (noun)
the upper lip	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