cleavage vs cleave

cleavage is a noun but cleave is not a noun.

Word	Noun	Adjective	Verb	Adverb
cleavage	Yes	No	No	No
cleave	No	No	Yes	No

cleavage (noun)	cleave (noun)
the act of cleaving or splitting
the line formed by a groove between two parts (especially the separation between a woman's breasts)
(embryology) the repeated division of a fertilised ovum
the breaking of a chemical bond in a molecule resulting in smaller molecules
the state of being split or cleft

cleavage (verb)	cleave (verb)
	separate or cut with a tool, such as a sharp instrument
	make by cutting into
	come or be in close contact with; stick or hold together and resist separation