Essential
Essential adjective - Impossible to do without.
Theoretical and essential are semantically related. In some cases you can use "Theoretical" instead an adjective "Essential".
Theoretical
Theoretical adjective - Existing only as an assumption or speculation.
Essential and theoretical are semantically related. Sometimes you can use "Essential" instead an adjective "Theoretical".
Mutual synonyms
Cite this Source
Theoretical and Essential. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/essential/theoretical
Essential & Theoretical. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/essential/theoretical>.
Theoretical or Essential. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/essential/theoretical.
Google Ngram Viewer shows how "essential" and "theoretical" have occurred on timeline