Key
Key adjective - Coming before all others in importance.
Usage example: maintains that Sir Isaac Newton remains the key figure in physical science
Top and key are semantically related in principal topic. In some cases you can use "Top" instead the word "Key" as an adjective or a noun, when it comes to topics like main, important.
Mutual synonyms
How words are described
Both words in one sentence
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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 - With the exception of some key moments, most of what unfolds is exposition layered on top of more exposition, with not much plot inertia going on (similar to how The Wire started; see below).
Source: Slow-Paced Beginning -
Key differences between their attire includes Lilly wearing a white tank top under her overalls, said overalls having a heart-shaped window (revealing the aforementioned tank top), and her pants being shorts instead of Billy's jeans.
Source: Gendered Outfit
Cite this Source
Top and Key. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/key/top
Key & Top. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/key/top>.
Top or Key. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/key/top.
Google Ngram Viewer shows how "key" and "top" have occurred on timeline