106 entries under essential topic. ×

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de rigueur(expression, adjective, basic, vital)
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empyreal(adjective, fundamental, supreme)
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empyrean(adjective, fundamental, supreme)
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expedient(adjective, basic, vital, required)
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incomparable(adjective, extreme, best, superlative)
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incumbent on(expression, adjective, basic, vital)
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mandatory(adjective, basic, vital, required)
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max(adjective, extreme, best, superlative)
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maxi(adjective, extreme, best, superlative)
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maximum(adjective, extreme, best, superlative)
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most(adjective, extreme, best, superlative)
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name of game(expression, adjective, idiom, basic)
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name of the game(expression, idiom, important, critical)
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necessitous(required, needed)
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needful(adjective, basic, vital, required)
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obligatory(adjective, basic, vital, required)
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quintessential(adjective, important, basic, vital)
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specified(adjective, basic, vital, required)
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sublime(adjective, important, critical, fundamental)
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towering(adjective, extreme, best, superlative)
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APASmart Define. (2016). significant thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, significant thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "significant thesaurus" 4 March 2016. Web. 24 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>