Yes, expresses is a Scrabble word!

Verb

1. Give expression to

2. Articulate; either verbally or with a cry, shout, or noise

3. Serve as a means for expressing something

4. Indicate through a symbol, formula, etc.

5. Manifest the effects of (a gene or genetic trait)

6. Obtain from a substance, as by mechanical action

7. Send by rapid transport or special messenger service

Noun

1. Mail that is distributed by a rapid and efficient system

2. Public transport consisting of a fast train or bus that makes only a few scheduled stops

3. Rapid transport of goods