The difference between Mom and Niece
When used as nouns, mom means mother, whereas niece means a daughter of one's sibling, brother-in-law, or sister-in-law.
check bellow for the other definitions of Mom and Niece
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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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Niece as a noun:
A daughter of one's sibling, brother-in-law, or sister-in-law; either the daughter of one's brother ("fraternal niece"), or of one's sister ("sororal niece").
Examples:
"My niece just celebrated her 15th birthday."