59 entries under essential topic. ×
| vital(adjective, importance, important, valuable) | |
| principal(adjective, lead, important, head, significant) | |
| fundamental(noun, adjective, important, head, significant) | |
| main(adjective, lead, important, head, significant) | |
| cardinal(noun, adjective, lead, important, head) | |
| chief(adjective, lead, important, head, significant) | |
| primary(adjective, lead, important, head, significant) | |
| crucial(adjective, important, significant, original) | |
| major(adjective, lead, important, head, significant) | |
| material(adjective, importance, important, significant, large) | |
| prime(adjective, lead, important, head, significant) | |
| basic(adjective, important, head, significant, beginning) | |
| pivotal(adjective, important) | |
| leading(adjective, important, head, significant, beginning) | |
| constitutive(adjective, importance, valuable, main) | |
| critical(adjective, important, significant, basic) | |
| indispensable(adjective, important, significant, critical) | |
| decisive(adjective, important, significant, critical) | |
| elementary(adjective, important, head, significant, beginning) | |
| necessary(adjective, important, significant, critical) |
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| APA | Smart Define. (2016). key thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/key/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "key thesaurus" https://smartdefine.org/key/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, key thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/key/thesaurus/synonyms>. |
| MLA | Smart Define. "key thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/key/thesaurus/synonyms> |