mommy vs mammy

mommy and mammy both are nouns.

Word	Noun	Adjective	Verb	Adverb
mommy	Yes	No	No	No
mammy	Yes	No	No	No

As nouns, mommy and mammy are synonyms defined as:

Other synonyms of mommy include ma, mama, mamma, mom, momma, mum, mumma, mummy.

mommy (noun)	mammy (noun)
informal terms for a mother	informal terms for a mother
	an offensive term for a Black nursemaid in the southern U.S.