| semantic | |
| significant(important, original, basic, vital, major) | |
| structurally | |
| structures | |
| substantive | |
| substratal(important, significant, original, basic, vital) | |
| substrative(important, significant, original, basic, vital) | |
| substructural | |
| superstructural | |
| supporting(important, significant, original, basic, vital) | |
| sustaining(important, significant, original, basic, vital) | |
| syntactic | |
| syntactical(adjective, grammatical) | |
| tagmemic | |
| textural | |
| theoretical(important, significant, original, basic, vital) | |
| transitive | |
| underived(important, significant, original, basic, vital) | |
| underlying(important, original, basic, vital, primary) | |
| vital(adjective, material, important, natural, original) |
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| APA | Smart Define. (2015). structural thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/structural/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "structural thesaurus" https://smartdefine.org/structural/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, structural thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/structural/thesaurus/synonyms>. |
| MLA | Smart Define. "structural thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/structural/thesaurus/synonyms> |