68 entries under primary topic. ×

1
constitutional(adjective, important, significant, original, essential)
1
constitutive(important, significant, original, basic, vital)
1
controlling(adjective, outstanding, essential, prominent, prime)
1
deep(severe, original, basic, weighty)
1
elemental(adjective, important, significant, original, essential)
1
especial(adjective, superior, unusual, exceptional, distinct)
1
foundational(adjective, important, significant, original, essential)
1
grass-roots(adjective, important, significant, original, essential)
1
indispensable(adjective, important, significant, original, essential)
1
integral(adjective, important, significant, original, essential)
1
intrinsic(adjective, important, significant, original, essential)
1
meat-and-potatoes(adjective, important, significant, original, essential)
1
necessary(adjective, important, significant, original, essential)
1
original(adjective, important, significant, essential, basic)
1
primitive(adjective, important, significant, original, essential)
1
primordial(adjective, important, significant, original, essential)
1
requisite(adjective, important, significant, original, essential)
1
rudimentary(adjective, important, significant, original, essential)
1
sovereign(adjective, outstanding, prominent, prime, key)
1
structural(important, significant, original, basic, vital)
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APASmart Define. (2015). major thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/major/thesaurus/synonyms
ChicagoSmart Define. 2015. "major thesaurus" https://smartdefine.org/major/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, major thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/major/thesaurus/synonyms>.
MLASmart Define. "major thesaurus" 6 July 2015. Web. 24 September 2026. <https://smartdefine.org/major/thesaurus/synonyms>