Envelope
Envelope noun - A flat (usually rectangular) container for a letter, thin package, etc..
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Synonyms for Envelope
Folder and envelope are semantically related In some cases you can use "Folder" instead a noun "Envelope".
Folder
Folder noun - A short printed publication with no cover or with a paper cover.
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Synonyms for Folder
Mutual synonyms
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Folder and Envelope. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/envelope/folder
Envelope & Folder. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/envelope/folder>.
Folder or Envelope. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/envelope/folder.
Google Ngram Viewer shows how "envelope" and "folder" have occurred on timeline