cleft lip vs cheiloschisis

cleft lip and cheiloschisis both are nouns.

Word	Noun	Adjective	Verb	Adverb
cleft lip	Yes	No	No	No
cheiloschisis	Yes	No	No	No

As nouns, cleft lip and cheiloschisis are synonyms defined as:

cleft lip and cheiloschisis: a congenital cleft in the middle of the upper lip

Other synonyms of cleft lip include harelip.

cleft lip (noun)	cheiloschisis (noun)
a congenital cleft in the middle of the upper lip	a congenital cleft in the middle of the upper lip