Envelope
Envelope noun - A flat (usually rectangular) container for a letter, thin package, etc..
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Synonyms for Envelope
Sheaths and envelope are semantically related In some cases you can replace term "Sheaths" with "Envelope", this nouns are similar.
Sheaths
Cite this Source
Sheaths and Envelope. (2016). Retrieved 2026, August 11, from https://thesaurus.plus/related/envelope/sheaths
Envelope & Sheaths. N.p., 2016. Web. 11 Aug. 2026. <https://thesaurus.plus/related/envelope/sheaths>.
Sheaths or Envelope. 2016. Accessed August 11, 2026. https://thesaurus.plus/related/envelope/sheaths.
Google Ngram Viewer shows how "envelope" and "sheaths" have occurred on timeline