embryology vs cleavage

embryology and cleavage both are nouns.

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

embryology (noun)	cleavage (noun)
the branch of biology that studies the formation and early development of living organisms	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