Niece vs. Goddaughter

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").

‘My niece just celebrated her 15th birthday.’;

Goddaughternoun

A female child whose baptism is sponsored by a godparent.

Niecenoun

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

Goddaughternoun

A female for whom one becomes sponsor at baptism.

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.

Goddaughternoun

a female godchild

Niecenoun

a daughter of your brother or sister