30 entries under essential topic. ×

1
basic(important, critical, fundamental, key)
1
bottom-line(important, critical, basic, fundamental)
1
cardinal(important, critical, basic, fundamental)
1
coal-and-ice(adjective, important, significant, critical)
1
constitutive(important, critical, basic, fundamental)
1
critical(big, heavy, important, substantial)
1
crucial(big, heavy, important, substantial)
1
decisive(important, critical, basic, fundamental)
1
fundamental(important, critical, basic, key)
1
heavy(adjective, big, unusual, important, exceptional)
1
imperative(important, critical, basic, fundamental)
1
indispensable(important, critical, basic, fundamental)
1
integral(important, critical, basic, fundamental)
1
key(important, critical, basic, fundamental)
1
life-or-death(adjective, important, significant, critical)
1
meaningful(adjective, big, unusual, heavy, important)
1
meat-and-potatoes(important, critical, basic, fundamental)
1
name(adjective, important, significant, critical)
1
name-of-the-game(adjective, important, significant, critical)
1
necessary(important, critical, basic, fundamental)
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APASmart Define. (2015). underlined thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/underlined/thesaurus/synonyms
ChicagoSmart Define. 2015. "underlined thesaurus" https://smartdefine.org/underlined/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, underlined thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/underlined/thesaurus/synonyms>.
MLASmart Define. "underlined thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/underlined/thesaurus/synonyms>