Necessary
Vital
Vital adjective - Impossible to do without.
Usage example: I forgot one vital ingredient, and now the biscuits taste strange
Necessary is a synonym for vital in essential topic. You can use "Necessary" instead the word "Vital" as an adjective or a noun, if it concerns topics such as life-preserving.
Mutual synonyms
Related pairs
Both words in one sentence
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Isaac Asimov's The End of Eternity is basically a rejection of this trope, essentially arguing that progress — even that which seems dangerous — is vital and necessary to us as a species.
Source: Science Is Bad - Assassins in Guild Wars are generally treated with respect, partially due to their killing abilities, but also because their works are (unfortunately) vital and necessary.
Source: Dark Is Not Evil / Video Games - In a World... in which Start to Corpse is a statistic vital to drinking games around the globe, it is necessary to have a Victim of the Week.
Source: Victim of the Week
Cite this Source
Vital and Necessary. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/necessary/vital
Necessary & Vital. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/necessary/vital>.
Vital or Necessary. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/necessary/vital.
Google Ngram Viewer shows how "necessary" and "vital" have occurred on timeline