mammy vs mama

mammy and mama both are nouns.

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

As nouns, mammy and mama are synonyms defined as:

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

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