Coupons
Keys
Mutual synonyms
Both words in one sentence
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Certain "keys" don't actually open a door but instead act as Plot Coupons that unlock harder difficulty modes.
Source: Interchangeable Antimatter Keys -
Both Diddy Kong Racing and Donkey Kong 64 feature gigantic gold keys as plot coupons; finding or using a key is always a momentous occasion.
Source: Creator / Rare -
Plot Coupons: At one point, Garrett has to find the four keys to a locked cathedral.
Cite this Source
Keys and Coupons. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/coupons/keys
Coupons & Keys. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/coupons/keys>.
Keys or Coupons. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/coupons/keys.
Google Ngram Viewer shows how "coupons" and "keys" have occurred on timeline