mamma vs mum

mamma and mum both are nouns.

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

As nouns, mamma and mum are synonyms defined as:

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

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

mamma (adjective)	mum (adjective)
	failing to speak or communicate etc when expected to