Key
Key adjective - Coming before all others in importance.
Usage example: maintains that Sir Isaac Newton remains the key figure in physical science
Major is a synonym for key in essential topic. In some cases you can use "Major" instead the word "Key" as an adjective or a noun, when it comes to topics like principal, main, important, crucial. popular alternative
Major
Major adjective - Having great meaning or lasting effect.
Usage example: a major change in how science is taught in our high schools
Key is a synonym for major in important topic. You can use "Key" instead the word "Major" as an adjective or a noun, if it concerns topics such as principal, main, significant, fundamental. popular alternative
Mutual synonyms
Both words in one sentence
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The character models also look amazing, with full detail and stunning motion capture work; each key or major character has their own distinct look and come fully equipped with their own ranges of motion, subtle quirks and realistic facial expressions.
Source: Video Game / GoldenEye Wii - In Kingdom Hearts, the main weapon featured in the series, wielded by many major characters, and all main playable ones, is a giant magical key that they hit people with.
- The song is played in the key of A-major but shifts to B-major for the final chorus.
Source: Truck Driver's Gear Change
Cite this Source
Major and Key. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/key/major
Key & Major. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/key/major>.
Major or Key. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/key/major.
Google Ngram Viewer shows how "key" and "major" have occurred on timeline