choir's in French:

1. chorale

French word "choir's"(chorale) occurs in sets:

Fiches du livre - "My Man Sandy" (J. B. Salmond)
Fiches du livre - "Mary Cary "Frequently Martha"" ...
Fiches du livre - "Religious Folk-Songs of the Sou...
Fiches du livre - "How France Built Her Cathedrals...