amnion vs amnios

amnion and amnios both are nouns.

Word	Noun	Adjective	Verb	Adverb
amnion	Yes	No	No	No
amnios	Yes	No	No	No

As nouns, amnion and amnios are synonyms defined as:

amnion and amnios: thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

Other synonyms of amnion include amniotic sac.

amnion (noun)	amnios (noun)
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)	thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)