Yes, tacks is a Scrabble word!

Verb

1. Fasten with tacks

2. Turn into the wind

3. Create by putting components or members together

4. Sew together loosely, with large stitches

5. Fix to; attach

6. Reverse (a direction, attitude, or course of action)

Noun

1. The heading or position of a vessel relative to the trim of its sails

2. A short nail with a sharp point and a large head

3. Gear for a horse

4. (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind

5. (nautical) the act of changing tack

6. Sailing a zigzag course