108 entries under primary topic. ×

7
uppermost(adjective, sound, excellent, lead, fine)
6
aboriginal(adjective, pure, head, beginning, first)
6
arch(adjective, order, lead, heavy, head)
6
basal(adjective, body, lead, material, pure)
6
highest(adjective, order, quality, bad, tough)
6
matchless(adjective, bad, great, tough, top)
6
preeminent(adjective, order, bad, tough, top)
5
controlling(adjective, top, head, essential, prominent)
5
early(adjective, head, beginning, opening, original)
5
foundational(adjective, pure, important, significant, original)
5
incipient(adjective, head, beginning, opening, original)
5
momentous(adjective, good, intense, important, significant)
5
necessary(adjective, body, material, important, significant)
5
pristine(adjective, new, head, beginning, fresh)
5
rudimentary(adjective, important, head, significant, beginning)
5
sovereign(adjective, great, excellent, perfect, super)
5
star(adjective, lead, head, master, boss)
5
transcendent(adjective, good, bad, great, tough)
5
underlying(adjective, important, significant, original, essential)
4
crowning(adjective, top, excellent, fine, superior)
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APASmart Define. (2016). prime thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/prime/thesaurus/synonyms
ChicagoSmart Define. 2016. "prime thesaurus" https://smartdefine.org/prime/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, prime thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/prime/thesaurus/synonyms>.
MLASmart Define. "prime thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/prime/thesaurus/synonyms>