75 entries under important topic. ×

19
primary(adjective, lead, head, significant)
18
key(adjective, lead, head, master)
18
cardinal(noun, adjective, lead, head)
16
fundamental(adjective, significant, original, essential)
16
essential(adjective, significant, original, basic)
16
chief(adjective, lead, head, significant)
15
main(adjective, lead, head, significant)
15
pivotal(adjective, critical, vital, main)
15
prime(adjective, lead, head, significant)
14
principal(adjective, lead, head, significant)
13
intrinsic(adjective, basic, vital, private)
10
crucial(adjective, significant, original, essential)
10
leading(adjective, top, head, essential)
10
paramount(adjective, significant, original, essential)
9
basic(adjective, significant, original, essential)
9
vital(adjective, significant, original, essential)
7
major(adjective, lead, head, significant)
7
significant(adjective, original, basic, vital)
6
critical(adjective, significant, essential, vital)
6
radical(adjective, basic, vital, main)
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APASmart Define. (2015). central thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/central/thesaurus/synonyms
ChicagoSmart Define. 2015. "central thesaurus" https://smartdefine.org/central/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, central thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/central/thesaurus/synonyms>.
MLASmart Define. "central thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/central/thesaurus/synonyms>