Extra
Extra noun - Something given in addition to what is ordinarily expected or owed.
Usage example: as an extra, the dealer filled the tank of my new car
Premium
Premium noun - Something given in recognition of achievement.
Both words in one sentence
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The premium currency is primarily used to speed up the game's timers, though there are also extra heroes and a couple alternate costumes that can be bought with it.
Source: Video Game / Avengers Academy - The American equivalent, Encore Westerns on the other hand hasn't decayed by design, since it's part of the Starz premium package that you pay extra for to get a channel devoted to westerns.
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You can pay for coins (the premium game currency), which can get you premium items that allow you to access extra stories and/or CGs or allow you to go through the main story without waiting.
Source: Allegedly Free Game
Cite this Source
Premium and Extra. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/extra/premium
Extra & Premium. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/extra/premium>.
Premium or Extra. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/extra/premium.
Google Ngram Viewer shows how "extra" and "premium" have occurred on timeline