Act
Act noun - Something done by someone.
Usage example: it's acts such as this—lying about having to work late—that make me feel like I can't trust you
Undertaking is a synonym for act in deed topic. In some cases you can use "Undertaking" instead a noun "Act", when it comes to topics like something done.
Undertaking
Undertaking noun - Any piece of work that is undertaken or attempted.
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Synonyms for Undertaking
Mutual synonyms
How words are described
Both words in one sentence
- The assumed benefit of such an act is that everyone on the team — whether it be an actual army intent on conquest, or any party pursuing a risky undertaking will show maximum commitment if they know that retreat is impossible.
Source: Burning the Ships - The anime is scarcely less daunting an undertaking, with 193 episodes including the plot-resolving Final Act.
Source: Archive Panic
Cite this Source
Undertaking and Act. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/act/undertaking
Act & Undertaking. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/act/undertaking>.
Undertaking or Act. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/act/undertaking.
Google Ngram Viewer shows how "act" and "undertaking" have occurred on timeline