mummy vs mommy

mummy and mommy both are nouns.

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

As nouns, mummy and mommy are synonyms defined as:

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

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