Yes, stamp is a Scrabble word!

Verb

1. Walk heavily

2. To mark, or produce an imprint in or on something

3. Reveal clearly as having a certain character

4. Affix a stamp to

5. Treat or classify according to a mental stereotype

6. Destroy or extinguish as if by stamping with the foot

7. Form or cut out with a mold, form, or die

8. Crush or grind with a heavy instrument

9. Raise in a relief

Noun

1. The distinctive form in which a thing is made

2. A type or class

3. A symbol that is the result of printing or engraving

4. A small adhesive token stuck on a letter or package to indicate that that postal fees have been paid

5. Something that can be used as an official medium of payment

6. A small piece of adhesive paper that is put on an object to show that a government tax has been paid

7. Machine consisting of a heavy bar that moves vertically for pounding or crushing ores

8. A block or die used to imprint a mark or design

9. A device incised to make an impression; used to secure a closing or to authenticate documents