mummy vs female parent

mummy and female parent both are nouns.

Word	Noun	Adjective	Verb	Adverb
mummy	Yes	No	No	No
female parent	Yes	No	No	No

As nouns, female parent is a hypernym of mummy; that is, female parent is a word with a broader meaning than mummy:

mummy: informal terms for a mother
female parent: a woman who has given birth to a child (also used as a term of address to your mother)

Other hypernyms of mummy include mother.

mummy (noun)	female parent (noun)
a body embalmed and dried and wrapped for burial (as in ancient Egypt)	a woman who has given birth to a child (also used as a term of address to your mother)
informal terms for a mother