93 entries under basic topic. ×

8
critical(adjective, big, important, significant, substantial)
7
prime(adjective, body, material, important, significant)
6
paramount(adjective, important, significant, original, substantial)
5
central(adjective, important, significant, original, essential)
5
demand(noun, want, need, essential, certainty)
5
desideratum(noun, want, need, essential, certainty)
5
elementary(adjective, easy, important, significant, original)
5
integral(adjective, body, material, important, significant)
5
primary(adjective, body, material, big, important)
5
want(noun, verb, need, essential, certainty)
4
basal(adjective, body, material, important, significant)
4
underlying(adjective, important, significant, original, essential)
3
bottom-line(adjective, important, significant, original, essential)
3
elemental(adjective, body, material, important, significant)
3
intrinsic(adjective, important, significant, original, essential)
3
primitive(adjective, body, material, important, significant)
2
bottom(adjective, important, significant, original, essential)
2
in demand(expression, adjective, idiom, main)
2
inherent(material, natural, essential, key)
2
innate(material, natural, living, functional)
10 years ago|19k views|share |citing 
APASmart Define. (2015). necessary thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 20 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>