Key
Key adjective - Coming before all others in importance.
Of service and key are semantically related. In some cases you can use "Of service" instead an adjective "Key".
Of service
Key and of service are semantically related. Sometimes you can use "Key" instead an adjective phrase "Of service".
Both terms in one sentence
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Will wagers his soul, meaning an eternity of service, against Jones to goad him into wagering the key to the chest containing his Soul Jar.
Source: Absurdly High-Stakes Game
Cite this Source
Of service and Key. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/key/of_service
Key & Of service. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/key/of_service>.
Of service or Key. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/key/of_service.
Google Ngram Viewer shows how "key" and "of service" have occurred on timeline