Yes, pinner is in the scrabble dictionary.

Is Pinner a real word?

A person or thing that pins. A caplike headdress with a long, hanging flap pinned on either side, formerly worn by women. Agent noun of pin; one who pins.

What does Pinner mean?

1 : a woman's cap with long lappets worn in the 17th and 18th centuries. 2 : one that pins.