mom vs mummy

mom and mummy both are nouns.

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

As nouns, mom and mummy are synonyms defined as:

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

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