Key
Key adjective - Coming before all others in importance.
Successful and key are semantically related. In some cases you can use "Successful" instead an adjective "Key".
Successful
Successful adjective - Having attained a desired end or state of good fortune.
Key and successful are semantically related. Sometimes you can use "Key" instead an adjective "Successful".
Mutual synonyms
Both words in one sentence
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This was one of the key moments in the battle, as a successful charge by Stuart would have made a Union victory much more difficult.
- It's generally considered one of the key reasons the games have been so successful.
Source: Adaptation Distillation -
The format is so successful in the OCG format that some of its key cards are banned (and for them, it's rightfully so).
Source: Americans Hate Tingle
Cite this Source
Successful and Key. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/key/successful
Key & Successful. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/key/successful>.
Successful or Key. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/key/successful.
Google Ngram Viewer shows how "key" and "successful" have occurred on timeline