Mail slots
Postboxes and mail slots are semantically related. In some cases you can use "Postboxes" instead a noun phrase "Mail slots".
Postboxes
Mail slots and postboxes are semantically related. You can use "Mail slots" instead a noun "Postboxes".
Mutual synonyms
Cite this Source
Postboxes and Mail slots. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/mail_slots/postboxes
Mail slots & Postboxes. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/mail_slots/postboxes>.
Postboxes or Mail slots. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/mail_slots/postboxes.
Google Ngram Viewer shows how "mail slots" and "postboxes" have occurred on timeline