Pigeonhole

голуби́ное гнездо́

golubínoje gnezdó

(one of an array of open compartments for housing pigeons in a dovecote)

отделе́ние для бума́г

otdelénije dlja bumág

(one of an array of open compartments in a desk, set of shelves, etc., used for sorting and/or storing letters, papers, or other items; one of an array of open compartments for receiving mail and other messages at a college, office, etc.)