What is a compound word for collar?

There isn't a single perfect compound word for "collar," as the concept is fairly broad. However, depending on the specific context, you might use these:

* Collarbone: The bone that connects the shoulder blade to the breastbone.

* Collar-stud: A small button used to fasten a collar.

* Collar-bone: Another way to refer to the collarbone.

* Necklace-collar: A type of collar that is also a necklace.

* Collar-and-cuff: A set of clothing items, typically a shirt, that includes a collar and cuffs.

Ultimately, the best compound word depends on what you're trying to describe.