Letterbox
Mailslot
Mutual synonyms
Cite this Source
Mailslot and Letterbox. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/letterbox/mailslot
Letterbox & Mailslot. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/letterbox/mailslot>.
Mailslot or Letterbox. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/letterbox/mailslot.
Google Ngram Viewer shows how "letterbox" and "mailslot" have occurred on timeline