Knockoff
Knockoff noun - An unauthorized copy or imitation.
Prototype
Prototype noun - One of a group or collection that shows what the whole is like.
Both words in one sentence
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Commander Keen naturally does this since the prototype of his game's engine was a "Copyright Infringement" knockoff of Super Mario Bros. 3.
Source: Death Throws -
Evil Knockoff: Zeon engineers build their own Guntank to compete against the prototype Zaku MW-01.
Cite this Source
Prototype and Knockoff. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/knockoff/prototype
Knockoff & Prototype. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/knockoff/prototype>.
Prototype or Knockoff. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/knockoff/prototype.
Google Ngram Viewer shows how "knockoff" and "prototype" have occurred on timeline