Yes, collar is a Scrabble word!

Verb

1. Take into custody

2. Seize by the neck or collar

3. Furnish with a collar

Noun

1. A band that fits around the neck and is usually folded over

2. (zoology) an encircling band or marking around the neck of any animal

3. Anything worn or placed about the neck

4. A short ring fastened over a rod or shaft to limit, guide, or secure a machine part

5. The stitching that forms the rim of a shoe or boot

6. A band of leather or rope that is placed around an animal's neck as a harness or to identify it

7. Necklace that fits tightly around a woman's neck

8. A figurative restraint

9. The act of apprehending (especially apprehending a criminal)