Essential
Source
Source noun - A point or place at which something is invented or provided.
Both words in one sentence
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E.g., in some versions of the first game, you can't put your invisibility cloak back on after sending Norbert away, since getting caught is essential to the plot of the source material.
Source: Stupidity Is the Only Option -
One of the key tips on wilderness survival is to find and eat earthworms since they're a safe and readily accessible source of essential protein, DESPITE the fact that they're raw and alive...
Source: Reduced to Ratburgers -
With such a deliberate change to the source material, you'd think it would be an essential part of her character, right?
Cite this Source
Source and Essential. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/essential/source
Essential & Source. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/essential/source>.
Source or Essential. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/essential/source.
Google Ngram Viewer shows how "essential" and "source" have occurred on timeline