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In English there are no masculine or feminine forms. English uses gender specific nouns for a male or a female. The noun nephew is a word for a male relative; the noun niece is a word for a female relative.
Yes, nephew is a noun.
Yes, nephew is a noun, a common, singular noun.
Your brother's (or your sister's) son is your nephew and you are his aunt if you are a female or his uncle if you are a male.
The noun nephew is a singular, common, abstract noun, a word for the relationship of a person or a concrete noun, a word for the person with such a relationship.
A Lion
You are your nephew's uncle if you are male, and his aunt if you are female.
Niece would be the female counterpart for a nephew.
Male niece is female
Here are three sentences with the word 'niece': "My niece was born yesterday." "I am an uncle because I have a niece." "My sister has a child and therefore she is my niece."
Nephews.
There is no "opposite" of a nephew, unless you say that since a nephew is male, the opposite is a niece, who is female.