59 entries under essential topic. ×
| needed(important, critical, basic, fundamental) | |
| nitty-gritty(adjective, important, critical, basic) | |
| prerequisite(important, critical, basic, fundamental) | |
| radical(important, significant, original, basic) | |
| required(important, critical, basic, fundamental) | |
| substratal(adjective, important, significant, original) | |
| underlined(important, critical, basic, fundamental) | |
| urgent(important, significant, critical, basic) | |
| bottom line(expression, important, significant, basic) | |
| coal and ice(expression, idiom, important, critical) | |
| congenital(adjective, basic, absolute, fundamental) | |
| connate(adjective, basic, absolute, fundamental) | |
| inborn(adjective, basic, absolute, fundamental) | |
| inbred(adjective, basic, absolute, fundamental) | |
| innate(adjective, basic, absolute, fundamental) | |
| meat and potatoes(expression, adjective, idiom, important, significant) | |
| name of the game(expression, adjective, idiom, important) | |
| natural(noun, adjective, edge, tone) | |
| particular(basic, chief, foremost, inherent) |
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| APA | Smart Define. (2016). key thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/key/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "key thesaurus" https://smartdefine.org/key/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, key thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/key/thesaurus/synonyms>. |
| MLA | Smart Define. "key thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/key/thesaurus/synonyms> |