38 entries under elementary topic. ×

1
necessary(adjective, important, significant, original, essential)
1
original(adjective, important, significant, essential, basic)
1
paramount(adjective, important, significant, original, essential)
1
primary(adjective, important, significant, original, essential)
1
prime(adjective, important, significant, original, essential)
1
primitive(adjective, important, significant, original, essential)
1
primordial(adjective, important, significant, original, essential)
1
principal(adjective, important, significant, original, essential)
1
radical(adjective, important, significant, original, essential)
1
requisite(adjective, important, significant, original, essential)
1
rudimentary(adjective, important, significant, original, essential)
1
significant(adjective, important, original, essential, basic)
1
substratal(adjective, important, significant, original, essential)
1
substrative(adjective, important, significant, original, essential)
1
theoretical(adjective, important, significant, original, essential)
1
underived(adjective, important, significant, original, essential)
1
underlying(adjective, important, significant, original, essential)
1
vital(adjective, important, significant, original, essential)
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APASmart Define. (2015). sustaining thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/sustaining/thesaurus/synonyms
ChicagoSmart Define. 2015. "sustaining thesaurus" https://smartdefine.org/sustaining/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, sustaining thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/sustaining/thesaurus/synonyms>.
MLASmart Define. "sustaining thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/sustaining/thesaurus/synonyms>