letter box, n.
a private box for delivery of mail
<noun.artifact> freq. cnt.: 4 freq. cnt.: 4
letter box mailbox
semantic pointers
hypernym
public box for deposit of mail
<noun.artifact>
letter box mailbox postbox
a numbered compartment in a post office where mail is put to be called for
<noun.artifact>
PO Box POB Post-Office box call box letter box
semantic pointers
hypernym