Yes, bay is a Scrabble word!

Verb

1. Utter in deep prolonged tones

2. Bark with prolonged noises, of dogs

Adjective

1. (used of animals especially a horse) of a moderate reddish-brown color

Noun

1. An indentation of a shoreline larger than a cove but smaller than a gulf

2. The sound of a hound on the scent

3. Small Mediterranean evergreen tree with small blackish berries and glossy aromatic leaves used for flavoring in cooking; also used by ancient Greeks to crown victors

4. A compartment on a ship between decks; often used as a hospital

5. A compartment in an aircraft used for some specific purpose

6. A small recess opening off a larger room

7. A horse of a moderate reddish-brown color