myelinization vs ontogenesis

myelinization and ontogenesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
myelinization	Yes	No	No	No
ontogenesis	Yes	No	No	No

As nouns, ontogenesis is a hypernym of myelinization; that is, ontogenesis is a word with a broader meaning than myelinization:

myelinization: the development of a myelin sheath around a nerve fiber
ontogenesis: (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level

Other hypernyms of myelinization include development, growing, growth, maturation, ontogeny.

myelinization (noun)	ontogenesis (noun)
the development of a myelin sheath around a nerve fiber	(biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level