Key
Required
Required adjective - Impossible to do without.
Usage example: with these frigid winds, hats, scarves, and good mittens are required equipment for heading outside
Key and required are semantically related in essential topic. Sometimes you can use "Key" instead the word "Required" as an adjective or a noun.
Nearby Words: requirement, requiring
Mutual synonyms
Related pairs
Both words in one sentence
- Required Secondary Powers also proved key to defeating an Espada, Barragan, whose power was that his touch could rot and decay anything.
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But the latter requires pressing Select at the same time as the directional key corresponding to the weapon, and holding a directional key along with the B button is also required to jump any way but down, which is often the worst direction to jump.
Source: Some Dexterity Required -
In Burning Crusade, the heroics required you to run the dungeon enough so that you are revered with the appropriate faction and can purchase the heroic key.
Source: Anti-Frustration Features
Cite this Source
Required and Key. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/key/required
Key & Required. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/key/required>.
Required or Key. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/key/required.
Google Ngram Viewer shows how "key" and "required" have occurred on timeline