Fill in
Fill in verb - To serve as a replacement usually for a time only.
Usage example: she's only filling in while the regular secretary is on vacation
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Synonyms for Fill in
Substitute is a synonym for fill in. In some cases you can use "Substitute" instead the word "Fill in" as a verb or a noun. popular alternative
Substitute
Substitute verb - To serve as a replacement usually for a time only.
Usage example: substituting for the talk show host while she is on vacation
Fill in is a synonym for substitute in deputize topic. You can use "Fill in" instead a verb "Substitute". popular alternative
Mutual synonyms
Related pairs
Both terms in one sentence
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A few times throughout the series, Caroline Ingalls (Karen Grassle) would fill in as a substitute teacher, except when the plot called for someone else.
Source: Schoolmarm - A few levels after Gai is defeated, Riki and Mami encounter a doppelganger of him that was raised to fill in as the Cosmo Gang's substitute leader, to the point that no one remembers who he is anymore.
Source: Body Double - Saving Christmas: The "Substitute Santa" arc where Caligos accidentally makes Santa throw his back out and has to fill in.
Source: Webcomic / Jix
Cite this Source
Substitute and Fill in. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/fill_in/substitute
Fill in & Substitute. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/fill_in/substitute>.
Substitute or Fill in. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/fill_in/substitute.
Google Ngram Viewer shows how "fill in" and "substitute" have occurred on timeline