mom vs mamma

mom and mamma both are nouns.

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

As nouns, mom and mamma are synonyms defined as:

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

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