123 entries under basic topic. ×

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duck soup(adjective, simple)
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exigent(adjective, significant, essential, vital)
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expedient(adjective, significant, essential, vital)
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hidden(adjective, original, fundamental, primary)
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imperative(adjective, significant, essential, vital)
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incumbent on(expression, adjective, significant, essential)
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lurking(adjective, original, fundamental, primary)
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mandatory(adjective, significant, essential, vital)
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momentous(adjective, significant, essential, vital)
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needed(adjective, significant, essential, vital)
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nubber(absolute, fundamental, primo, substratal)
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nuts and bolts(expression, idiom, fundamental)
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obligatory(adjective, significant, essential, vital)
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old(adjective, simple, rough, original)
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prerequisite(adjective, significant, essential, vital)
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pressing(adjective, significant, essential, vital)
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previous(first, initial)
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rooter(fundamental, latent)
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specified(adjective, significant, essential, vital)
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unavoidable(adjective, significant, essential, vital)
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APASmart Define. (2015). elementary thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/elementary/thesaurus/synonyms
ChicagoSmart Define. 2015. "elementary thesaurus" https://smartdefine.org/elementary/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, elementary thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/elementary/thesaurus/synonyms>.
MLASmart Define. "elementary thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/elementary/thesaurus/synonyms>