Yes, conventional is a Scrabble word!

Adjective

1. Following accepted customs and proprieties
2. Conforming with accepted standards
3. (weapons) using energy for propulsion or destruction that is not nuclear energy
4. Unimaginative and conformist
5. Represented in simplified or symbolic form
6. In accord with or being a tradition or practice accepted from the past
7. Rigidly formal or bound by convention