27 entries under natural topic. ×

32
organic(adjective, state, important, significant)
9
basic(adjective, material, important, vital)
7
constitutional(adjective, material, important, basic)
4
anatomical(adjective, material, basic, fundamental)
4
fundamental(adjective, material, important, original)
2
inherent(adjective, material, basic, living)
2
integral(adjective, important, significant, basic)
1
amoebic(adjective, material, basic, living)
1
animate(adjective, material, basic, living)
1
basal(adjective, material, important, basic)
1
biological(adjective, material, basic, living)
1
biotic(adjective, material, basic, living)
1
cellular(adjective, material, basic, living)
1
elemental(adjective, material, important, basic)
1
essential(adjective, material, important, basic)
1
innate(adjective, material, basic, living)
1
live(adjective, material, basic, living)
1
living(adjective, material, basic, functional)
1
necessary(adjective, material, important, basic)
1
nuclear(adjective, material, basic, living)
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APASmart Define. (2015). structural thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/structural/thesaurus/synonyms
ChicagoSmart Define. 2015. "structural thesaurus" https://smartdefine.org/structural/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, structural thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/structural/thesaurus/synonyms>.
MLASmart Define. "structural thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/structural/thesaurus/synonyms>