10
supreme(adjective, order, excellent, big, heavy)
9
earliest(adjective, start, simple, top, original)
9
firsthand(adjective, close, clear, direct, exact)
9
overriding(adjective, most important)
9
primeval(adjective, violent, head, beginning, vicious)
9
superior(adjective, top, excellent, lead, big)
8
head(noun, adjective, order, top, excellent)
8
immediate(adjective, close, clear, direct, top)
8
staple(adjective, lead, head, master, basic)
8
ultimate(adjective, essential, fundamental, supreme, intervening)
7
master(adjective, lead, head, boss)
7
outstanding(adjective, important, head, significant, essential)
7
simple(adjective, top, pure, straightforward, basic)
7
special(adjective, superior, unusual, important, exceptional)
7
uppermost(adjective, excellent, lead, big, important)
6
constitutional(adjective, body, material, important, significant)
6
crucial(adjective, big, important, significant, original)
6
foundational(adjective, simple, plain, base, pure)
6
greatest(adjective, top, excellent, superior, important)
6
incipient(adjective, head, beginning, original, prime)
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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>