Key and Reason

Key

Key noun - An explanatory list of the symbols on a map or chart.

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Reason and key are semantically related in rationalisation topic. In some cases you can use "Reason" instead a noun "Key", when it comes to topics like rationalization, explanation.

Nearby Words: keyed, keyboard, keying

Reason noun - A statement given to explain a belief or act.

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Key and reason are semantically related in rationalisation topic. Sometimes you can use "Key" instead a noun "Reason".

special	special key	special reason
particular	particular key	particular reason
similar	similar key	similar reason
specific	specific key	specific reason
Other adjectives: original, true, single, simple, actual, real, large, big, wrong, main, important, new, major, possible, strange, different.

In Drawn to Life: The Next Chapter for the DS, Mike eventually turns out to be a key character (he's the reason Mari turned to Wilfre).

Source: Chekhovs Gun / Video Games
From a meta perspective this "solution" also ignores a rather key piece of Sally's own character and the series' internal logic: that there's no reason girls can't be even tougher than boys.

Source: Conviction by Counterfactual Clue
The doormat is on top of a grate for some reason, so after you accidently knock the key down you have to go down and get it.

Source: Key Under the Doormat

Cite this Source

Reason and Key. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/key/reason

Key & Reason. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/key/reason>.

Reason or Key. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/key/reason.

Google Ngram Viewer shows how "key" and "reason" have occurred on timeline