16
dominant(adjective, top, excellent, big, important)
15
major(adjective, good, top, lead, fine)
14
initial(adjective, order, start, simple, plain)
14
key(adjective, lead, important, head, significant)
14
pre-eminent
14
predominant(adjective, good, important, exceptional, head)
14
primitive(adjective, body, cause, start, simple)
14
underlying(adjective, simple, plain, base, important)
13
basal(adjective, body, simple, lead, plain)
13
direct(adjective, clear, top, exact, active)
12
rudimentary(adjective, simple, plain, important, head)
11
aboriginal(adjective, cause, violent, pure, head)
11
premier(adjective, order, top, lead, superior)
11
primal(adjective, lead, pure, head, master)
11
radical(adjective, cause, base, importance, important)
11
vital(adjective, body, importance, material, big)
10
arch(adjective, order, top, lead, superior)
10
highest(adjective, order, top, excellent, superior)
10
introductory(adjective, simple, plain, head, beginning)
10
primordial(adjective, cause, start, violent, important)
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APASmart Define. (2016). primary thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/primary/thesaurus/synonyms
ChicagoSmart Define. 2016. "primary thesaurus" https://smartdefine.org/primary/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, primary thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/primary/thesaurus/synonyms>.
MLASmart Define. "primary thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/primary/thesaurus/synonyms>