Niece vs. Nephew

Niecenoun

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").

Niecenoun

A relative, in general; especially, a descendant, whether male or female; a granddaughter or a grandson.

Niecenoun

A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law. In modern English, this is the primary meaning.

Niecenoun

a daughter of your brother or sister

Nephewnoun

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).

Nephewnoun

(archaic) A son of one's child, grandson.

Nephewnoun

A grandson or grandchild, or remoter lineal descendant.

Nephewnoun

A cousin.

Nephewnoun

The son of a brother or a sister, or of a brother-in-law or sister-in-law.

Nephewnoun

a son of your brother or sister