epigenesis vs metamorphism

epigenesis and metamorphism both are nouns.

Word	Noun	Adjective	Verb	Adverb
epigenesis	Yes	No	No	No
metamorphism	Yes	No	No	No

As nouns, metamorphism is a hypernym of epigenesis; that is, metamorphism is a word with a broader meaning than epigenesis:

epigenesis: a geological change in the mineral content of rock after the rock has formed
metamorphism: change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances

epigenesis (noun)	metamorphism (noun)
a geological change in the mineral content of rock after the rock has formed	change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances