Synonyms for Chorus (same or very similar meaning)
WordNet sense 1 (a body of dancers or singers who perform together):
chorus lineWordNet sense 2 (a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play):
Greek chorusWordNet sense 3 (the part of a song where a soloist is joined by a group of singers):
refrainWordNet sense 4 (sing in a choir):
choirFrom the ODE community, based on WordNetadd/edit