81 entries under original topic. ×

29
primary(adjective, lead, importance, important, head)
26
principal(adjective, top, lead, importance, important)
22
prime(adjective, quality, lead, figure, superior)
20
essential(adjective, importance, important, significant)
20
fundamental(adjective, important, head, significant, beginning)
17
central(adjective, lead, important, head, significant)
17
key(adjective, lead, important, head, significant)
16
paramount(adjective, quality, tough, top, perfect)
14
first(adjective, order, quality, top, superior)
13
important(adjective, significant, essential, critical)
12
basic(adjective, important, head, significant, beginning)
12
vital(adjective, importance, important, significant)
9
major(adjective, lead, important, head, significant)
8
supreme(adjective, outstanding, prominent, prime)
8
underlying(adjective, important, significant, essential)
7
necessary(adjective, important, significant, essential)
7
crucial(adjective, important, significant, essential)
7
indispensable(adjective, important, significant, essential)
7
radical(adjective, importance, important, significant)
6
organic(adjective, important, significant, basic)
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APASmart Define. (2015). cardinal thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/cardinal/thesaurus/synonyms
ChicagoSmart Define. 2015. "cardinal thesaurus" https://smartdefine.org/cardinal/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, cardinal thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/cardinal/thesaurus/synonyms>.
MLASmart Define. "cardinal thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/cardinal/thesaurus/synonyms>