adopter vs adoptive parent

adopter and adoptive parent both are nouns.

Word	Noun	Adjective	Verb	Adverb
adopter	Yes	No	No	No
adoptive parent	Yes	No	No	No

As nouns, adopter and adoptive parent are synonyms defined as:

adopter and adoptive parent: a person who adopts a child of other parents as his or her own child

adopter (noun)	adoptive parent (noun)
a person who adopts a child of other parents as his or her own child	a person who adopts a child of other parents as his or her own child