Function
Function noun - What something is used for.
Usage example: the function of an auger is to bore holes
Usefulness and function are semantically related. In some cases you can use "Usefulness" instead a noun "Function".
Usefulness
Usefulness noun - The capacity for being useful for some purpose.
Function and usefulness are semantically related. Sometimes you can use "Function" instead a noun "Usefulness".
How words are described
Both words in one sentence
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Crutch Character: The wares he sells are useful in the early game, but by the time Hardmode comes around just about all of them have been surpassed in function or usefulness.
Source: Characters / Terraria -
Alloy S.H.I.V.s and potentially MEC Troopers can be used as partial and full-cover, respectively, but the usefulness of this function is mainly against weaker aliens.
Source: Video Game / XCOM: Enemy Unknown
Cite this Source
Usefulness and Function. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/function/usefulness
Function & Usefulness. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/function/usefulness>.
Usefulness or Function. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/function/usefulness.
Google Ngram Viewer shows how "function" and "usefulness" have occurred on timeline