metagenesis vs xenogenesis

metagenesis and xenogenesis both are nouns.

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

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

metagenesis: alternation of sexual and asexual generations
xenogenesis: 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, heterogenesis.

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