Yes, choruses is a Scrabble word!

Verb

1. Utter in unison

2. Sing in a choir

Noun

1. Any utterance produced simultaneously by a group

2. A group of people assembled to sing together

3. The part of a song where a soloist is joined by a group of singers

4. A body of dancers or singers who perform together

5. A company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play