147 entries under fundamental topic. ×
| bottom(noun, adjective, important, significant, original) | |
| doctrine(noun, rule, opinion, principle) | |
| necessity(noun, condition, want, heart, essential) | |
| root(noun, adjective, drop, part, material) | |
| imperative(noun, adjective, important, significant, essential) | |
| absolute(adjective, essential, key, supreme) | |
| needful(adjective, significant, original, essential, vital) | |
| prerequisite(noun, adjective, important, want, significant) | |
| required(adjective, important, significant, essential, critical) | |
| significant(adjective, important, original, essential, critical) | |
| structural(adjective, material, important, natural, original) | |
| best(adjective, essential, supreme) | |
| built-in(adjective, characteristic, natural, essential) | |
| compulsory(adjective, significant, essential, vital) | |
| decisive(adjective, important, significant, essential, critical) | |
| embryonic(simple, beginning, opening, original) | |
| heart(noun, law, part, condition, emotion) | |
| life-or-death(important, essential, critical, key) | |
| material(drop, part, element, essential, section) | |
| needed(adjective, important, significant, essential, critical) |
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| APA | Smart Define. (2015). basic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/basic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "basic thesaurus" https://smartdefine.org/basic/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, basic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/basic/thesaurus/synonyms>. |
| MLA | Smart Define. "basic thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/basic/thesaurus/synonyms> |