Key
Mutual synonyms
Both words in one sentence
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For once, the ancient alien stuff they've found is actually valuable and the key to killing the Brethren Moon in orbit.
Source: Video Game / Dead Space 3 -
Many shipyards operated along the banks of the river Clyde, particularly around Glasgow, and were considered so valuable that Clydeside became a key target in the Luftwaffe's bombing campaigns.
Source: Made in Country X - The key to this is the different procreative roles between men and women that makes the latter incomparably valuable when you reduce each gender to a resource.
Source: The Dulcinea Effect
Cite this Source
Valuable and Key. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/key/valuable
Key & Valuable. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/key/valuable>.
Valuable or Key. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/key/valuable.
Google Ngram Viewer shows how "key" and "valuable" have occurred on timeline