The difference between Mom and Mommy
When used as nouns, mom means mother, whereas mommy means mother.
Mommy is also adjective with the meaning: characteristic of a mother.
check bellow for the other definitions of Mom and Mommy
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Mom as a noun (Canada, US, West Midlands, colloquial, familiar):
mother.
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Mom as a noun (informal):
An adult female owner of a pet.
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Mommy as a noun (US, Canada, usually, childish):
Mother.
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Mommy as an adjective (US, Canada, rare, informal, chiefly, in the superlative):
Characteristic of a mother; motherly.
Examples:
"She is the mommiest of mommies."