Which one is not a singular?

The past participle form of "bear"

What is the verb form of "Friend"

Which gender of the word 'orphan'?

Which one of the following is common gender?

Masculine gender-

What is the masculine gender for "mare"?

Common gender-

Opposite gender of teacher

Masculine of duck

Opposite gender of bitch

Which is singular-

Which can be used as both singular and plural

Which plural can be used as singular

Faminine gender of don-

An unmarried woman is called-

Faminine gender of boar-

Which one is feminine-