cleavage vs embryology

cleavage and embryology both are nouns.

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

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