momma vs mammy

momma and mammy both are nouns.

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

As nouns, momma and mammy are synonyms defined as:

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

momma (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.