Extra
Extra noun - An interchangeable part or piece of equipment that is kept on hand for replacement of an original.
Fill-in
Fill-in noun - A person or thing that takes the place of another.
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Synonyms for Fill-in
Both words in one sentence
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Ascended Extra: Bruce Johnston quickly went from being a fill-in on tours to full-fledged band member.
Source: Music / The Beach Boys - Ascended Extra: Dylan Potts was originally a live fill-in before being asked to join full-time.
Source: Music / Rivers of Nihil
Cite this Source
Fill-in and Extra. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/extra/fill-in
Extra & Fill-in. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/extra/fill-in>.
Fill-in or Extra. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/extra/fill-in.