cosmogeny vs cosmogony

cosmogeny and cosmogony both are nouns.

Word	Noun	Adjective	Verb	Adverb
cosmogeny	Yes	No	No	No
cosmogony	Yes	No	No	No

As nouns, cosmogeny and cosmogony are synonyms defined as:

cosmogeny and cosmogony: the branch of astrophysics that studies the origin and evolution and structure of the universe

Other synonyms of cosmogeny include cosmology.

cosmogeny (noun)	cosmogony (noun)
the branch of astrophysics that studies the origin and evolution and structure of the universe	the branch of astrophysics that studies the origin and evolution and structure of the universe