The difference between Brother and Niece
When used as nouns, brother means son of the same parents as another person, whereas niece means a daughter of one's sibling, brother-in-law, or sister-in-law.
Brother is also verb with the meaning: to treat as a brother.
check bellow for the other definitions of Brother and Niece
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Brother as a noun:
Son of the same parents as another person.
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Brother as a noun:
A male having at least one parent in common with another (see half-brother, stepbrother).
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Brother as a noun:
A male fellow member of a religious community, church, trades union etc.
Examples:
"Thank you, brother."
"I would like to thank the brother who just spoke."
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Brother as a noun (African American Vernacular English):
A black male.
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Brother as a noun:
Somebody, usually male, connected by a common cause or situation.
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Brother as a noun:
Someone who is a peer, whether male or female.
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Brother as a verb (transitive):
To treat as a brother.
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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."