The difference between Nephew and Niece
When used as nouns, nephew means a son of one's sibling, brother-in-law, or sister-in-law, whereas niece means a daughter of one's sibling, brother-in-law, or sister-in-law.
check bellow for the other definitions of Nephew and Niece
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Nephew as a noun:
A son of one's sibling, brother-in-law, or sister-in-law; either a son of one's brother (fraternal nephew) or a son of one's sister (sororal nephew).
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Nephew as a noun (archaic):
A son of one's child, grandson.
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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."