Envelope
Envelope noun - A flat (usually rectangular) container for a letter, thin package, etc..
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Synonyms for Envelope
Safe and envelope are semantically related. In some cases you can use "Safe" instead a noun "Envelope".
Safe
Safe noun - A specially reinforced container to keep valuables safe.
How words are described
Both words in one sentence
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Kansas City Shuffle: Peter, a gambler, thinks he has outsmarted Lambrick when, given the choice between having your head held underwater for two minutes or chancing what's in a sealed envelope, he explains why the envelope is the safe bet.
Source: Film / Would You Rather -
You enter a Room containing a large safe with an envelope on top.
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The envelope contains a note from "A.S." addressed to you and mentions a key, which gets you started solving a series of puzzles (many of which involve the use of an eyepiece with a strange lens) that get more complicated as you go further into the safes contained within the safe.
Cite this Source
Safe and Envelope. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/envelope/safe
Envelope & Safe. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/envelope/safe>.
Safe or Envelope. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/envelope/safe.
Google Ngram Viewer shows how "envelope" and "safe" have occurred on timeline