metagenesis vs heterogenesis

metagenesis and heterogenesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
metagenesis	Yes	No	No	No
heterogenesis	Yes	No	No	No

As nouns, heterogenesis is a hypernym of metagenesis; that is, heterogenesis is a word with a broader meaning than metagenesis:

metagenesis: alternation of sexual and asexual generations
heterogenesis: the alternation of two or more different forms in the life cycle of a plant or animal

Other hypernyms of metagenesis include alternation of generations, xenogenesis.

metagenesis (noun)	heterogenesis (noun)
alternation of sexual and asexual generations	the alternation of two or more different forms in the life cycle of a plant or animal