64 entries under big topic. ×

40
principal(adjective, order, body, top, excellent)
36
chief(adjective, order, top, excellent, lead)
32
essential(adjective, body, simple, plain, importance)
24
leading(adjective, order, top, excellent, fine)
16
dominant(adjective, top, excellent, important)
15
major(adjective, good, top, lead, fine)
11
vital(adjective, body, importance, material)
10
supreme(adjective, order, excellent, heavy)
9
superior(adjective, top, excellent, lead)
7
uppermost(adjective, excellent, lead, important)
6
crucial(adjective, important, significant, original)
5
momentous(adjective, superior, unusual, important)
5
significant(adjective, superior, unusual, important)
4
material(adjective, body, important, significant)
4
necessary(adjective, body, material, important)
3
critical(adjective, important, significant, substantial)
3
large(adjective, significant, substantial, valuable)
3
salient(adjective, important, significant, substantial)
3
urgent(adjective, significant, substantial, valuable)
2
grave(important, significant, substantial, serious)
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APASmart Define. (2016). primary thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/primary/thesaurus/synonyms
ChicagoSmart Define. 2016. "primary thesaurus" https://smartdefine.org/primary/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, primary thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/primary/thesaurus/synonyms>.
MLASmart Define. "primary thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/primary/thesaurus/synonyms>