mummy vs mama

mummy and mama both are nouns.

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

As nouns, mummy and mama are synonyms defined as:

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

mummy (noun)	mama (noun)
a body embalmed and dried and wrapped for burial (as in ancient Egypt)	informal terms for a mother
informal terms for a mother