vocative

Of or pertaining to calling; used in calling or vocation.

Used in address; appellative; said of the case or form of the noun, pronoun, or adjective by which a person or thing is addressed.

In English, the vocative may be indicated by an addressee–address separation comma, or by the particle O, as in "What is the matter, sir?", "Mother, listen!", or "O Lord".

The vocative case

A word in the vocative case

A vocative expression

Something said to (or as though to) a particular person or thing; an entreaty, an invocation.

[T]he two latter will hardly come neither, if they think it will be to hear your whining vocatives.