| starting point | |
| stay(noun, beam, shaft, pole, pillar) | |
| stereobate | |
| stringer(noun, beam, shaft, letdown, pole) | |
| strip(noun, beam, shaft, pole, pillar) | |
| stylobate | |
| substratum | |
| substruction | |
| substructure | |
| summer | |
| terra firma | |
| tie(noun, beam) | |
| timber(noun, beam, shaft, letdown, pole) | |
| trestle(noun, beam, shaft, pole, pillar) | |
| truss(noun, beam) | |
| two-by-four(noun, beam, shaft, letdown, pole) | |
| underbuilding | |
| undercarriage | |
| undergirding | |
| underpinning |
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| APA | Smart Define. (2015). sill thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sill/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sill thesaurus" https://smartdefine.org/sill/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, sill thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sill/thesaurus/synonyms>. |
| MLA | Smart Define. "sill thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/sill/thesaurus/synonyms> |