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