Yes, bass is a Scrabble word!

Adjective

1. Having or denoting a low vocal or instrumental range

Noun

1. The lowest part of the musical range

2. The lowest part in polyphonic music

3. An adult male singer with the lowest voice

4. The lean flesh of a saltwater fish of the family Serranidae

5. Any of various North American freshwater fish with lean flesh (especially of the genus Micropterus)

6. The lowest adult male singing voice

7. The member with the lowest range of a family of musical instruments

8. Nontechnical name for any of numerous edible marine and freshwater spiny-finned fishes