sexual reproduction vs amphimixis

sexual reproduction and amphimixis both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual reproduction	Yes	No	No	No
amphimixis	Yes	No	No	No

As nouns, sexual reproduction and amphimixis are synonyms defined as:

sexual reproduction and amphimixis: reproduction involving the union or fusion of a male and a female gamete

sexual reproduction (noun)	amphimixis (noun)
reproduction involving the union or fusion of a male and a female gamete	union of sperm and egg in sexual reproduction
	reproduction involving the union or fusion of a male and a female gamete