cleave vs cleavage

cleave is not a noun while cleavage is a noun.

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

cleave (noun)	cleavage (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

cleave (verb)	cleavage (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