mommy vs mamma

mommy and mamma both are nouns.

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

As nouns, mommy and mamma are synonyms defined as:

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

mommy (noun)	mamma (noun)
informal terms for a mother	milk-secreting organ of female mammals
	informal terms for a mother