C3H4O1I1R1B3O1Y4
18 points
CHOIRBOY is validvalid
a boy who sings in a choir (a body of church singers) [n CHOIRBOYS]
a boy who sings in a church choir [n -S]
a boy who sings in a choir (a body of church singers) [n CHOIRBOYS]
a boy who sings in a church choir [n -S]