Yes, joint is a Scrabble word!

Verb

1. Fit as if by joints

2. Provide with a joint

3. Fasten with a joint

4. Separate (meat) at the joint

Adjective

1. United or combined

2. Affecting or involving two or more

3. Involving both houses of a legislature

Noun

1. (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion)

2. A disreputable place of entertainment

3. The shape or manner in which things come together and a connection is made

4. A piece of meat roasted or for roasting and of a size for slicing into more than one portion

5. Junction by which parts or objects are joined together

6. Marijuana leaves rolled into a cigarette for smoking