79 entries under essential topic. ×

14
key(adjective, lead, important, head, significant)
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)
12
rudimentary(adjective, simple, plain, important, head)
11
radical(adjective, cause, base, importance, important)
11
vital(adjective, body, importance, material, big)
10
primordial(adjective, cause, start, violent, important)
8
ultimate(adjective, fundamental, supreme, intervening)
7
outstanding(adjective, important, head, significant)
6
constitutional(adjective, body, material, important, significant)
6
crucial(adjective, big, important, significant, original)
6
foundational(adjective, simple, plain, base, pure)
5
number one(expression, adjective, order, lead, heavy)
5
overruling(adjective, importance, serious, basic)
5
preeminent(adjective, order, top, excellent, superior)
5
significant(adjective, superior, big, unusual, important)
4
controlling(adjective, outstanding, prominent, prime)
4
indispensable(adjective, important, significant, original, 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>