Yes, talk is a Scrabble word!

Verb

1. Exchange thoughts; talk with

2. Express in speech

3. Use language

4. Reveal information

5. Divulge confidential information or secrets

6. Deliver a lecture or talk

Noun

1. An exchange of ideas via conversation

2. Discussion; (`talk about' is a less formal alternative for `discussion of')

3. The act of giving a talk to an audience

4. A speech that is open to the public

5. Idle gossip or rumor