58 entries under key topic. ×

3
elemental(adjective, body, material, important, significant)
3
influential(adjective, great, big, important, significant)
3
intrinsic(adjective, important, significant, original, essential)
3
primitive(adjective, body, material, important, significant)
3
serious(adjective, big, important, significant, substantial)
2
big(adjective, great, significant, substantial, large)
2
capital(adjective, important, serious, essential, critical)
2
core(original, fundamental, main, chief)
2
head(chief, foremost)
2
inherent(material, natural, essential, basic)
2
life-or-death(adjective, important, essential, critical, basic)
2
relevant(adjective, clear, sound, reasonable, sensible)
1
coal-and-ice(important, essential, critical, basic, fundamental)
1
grave(adjective, great, big, important, significant)
1
highest(adjective, chief, foremost)
1
leading(adjective, important, serious, capital, essential)
1
major(adjective, important, significant, original, essential)
1
meaningful(adjective, big, important, significant, substantial)
1
name(important, essential, critical, basic, fundamental)
1
name-of-the-game(important, essential, critical, basic, fundamental)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 24 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>