Mommy
Part of speech: noun
Definition: mother (as used by young children)
Example sentence: Here's the thing with the costumes for 'Mommy': Given the background and social strata that the characters come from, you can't really imagine that they've gone shopping lately, so we went for that very normcore, fashionless era in history, the early 2000s, which was completely transitional.
Mummy
Part of speech: noun
Definition: A substance used in medicine prepared from mummified flesh.A pulp.An embalmed corpse wrapped in linen bandages for burial, especially as practised by the ancient Egyptians.Any naturally preserved human or animal body.A child's term for mother.
Example sentence: Mind you, I've always been musical... Mother used to sit me on her knee and I'd whisper, 'Mummy, Mummy, sing me a lullaby do,' and she'd say: 'Certainly my angel, my wee bundle of happiness, hold my beer while I fetch me banjo.'