Extra
Extra noun - An interchangeable part or piece of equipment that is kept on hand for replacement of an original.
Usage example: that portable player runs through batteries incredibly fast, so I always keep plenty of extras on hand
Reserve
Reserve noun - An interchangeable part or piece of equipment that is kept on hand for replacement of an original.
Usage example: don't throw that extra bike chain away, as I want to keep it as a reserve in case the current one breaks
Extra is a synonym for reserve in substitute topic. Sometimes you can use "Extra" instead the word "Reserve" as an adjective or a noun, if it concerns topics such as in reserve.
How words are described
Both words in one sentence
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Somewhat justified with Xandir, as he is a video game character with numerous extra lives in reserve.
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Unlike the point-based extra lives, these can be repeated in the second loop, allowing you to have up to eight lives in reserve.
Source: Video Game / Ketsui -
Extra Crispy buffed it back to a decent level, but also altered its ammo consumption so that Caleb only has 25 shots on a full reserve.
Source: Video Game / Blood
Cite this Source
Reserve and Extra. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/extra/reserve
Extra & Reserve. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/extra/reserve>.
Reserve or Extra. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/extra/reserve.
Google Ngram Viewer shows how "extra" and "reserve" have occurred on timeline