letterbox+◼◼◼noun[UK: ˈle.tə.bɒks] [US: ˈle.tə.bɑːks]
letter box+◼◼◻noun[UK: ˈle.tə(r) bɒks] [US: ˈle.tər ˈbɑːks]GB
postbox [postboxes]+noun[UK: ˈpəʊst.bɒks] [US: ˈpoʊst.bɑːks]
inbox+noun[UK: ɪn bɒks] [US: ɪn ˈbɑːks]
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