Key and Necessary

Similar meaning words

Key adjective - Of the greatest possible importance.

Usage example: first—and this is key—I wasn't even there that evening

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Necessary is a synonym for key in essential topic. In some cases you can use "Necessary" instead the word "Key" as an adjective or a noun.

Nearby Words: keyed, keyboard, keying

Necessary adjective - Impossible to do without.

Usage example: food and water are necessary for survival

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Key is a synonym for necessary in essential topic. Sometimes you can use "Key" instead the word "Necessary" as an adjective or a noun.

Nearby Words: necessity, necessarily

simple	simple key	simple necessary
small	small key	small necessary
powerful	powerful key	powerful necessary
real	real key	real necessary
Other adjectives: big, bad, important, magic, white, new, major, possible, minor, different.

Paper isn't necessary, as the key falls on a floor mat already protruding under the (very ill-fitting) door.

Source: Paper Key Retrieval Trick
The doors of many apartments and hotel rooms behave like most padlocks: The key isn't necessary to lock them (simply closing them is enough), making it very easy to lock the keys inside.

Source: The Key Is Behind the Lock
Hassle-Free Hotwire: On the way to being this, as more and more cars either incorporate a necessary processor into the key itself, or require the key fob to be present before they'll start.

Source: Discredited Trope

Cite this Source

Necessary and Key. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/key/necessary

Key & Necessary. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/key/necessary>.

Necessary or Key. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/key/necessary.

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