| threshold(noun, beginning, opening) | |
| beam(noun, support, beam, shaft, letdown) | |
| rafter(noun, support, beam, shaft, letdown) | |
| ledge(noun, bulge, projection, ridge, rack) | |
| doorsill | |
| girder(noun, support, beam, shaft, pole) | |
| groundsel | |
| joist(noun, support, beam, shaft, pole) | |
| lintel(noun, support, beam, shaft, letdown) | |
| shelf(noun, bulge, projection, ridge, rack) | |
| window sill(expression, idiom) | |
| doorstep | |
| bar(noun, shaft, timber, projection, rafter) | |
| cantilever(noun, support, beam, shaft, letdown) | |
| crossbar(noun, beam, shaft, letdown, pole) | |
| doorway | |
| entrance | |
| fundamental | |
| projection(noun, bulge, overhang) | |
| round |
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| APA | Smart Define. (2015). sill thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/sill/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sill thesaurus" https://smartdefine.org/sill/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, sill thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/sill/thesaurus/synonyms>. |
| MLA | Smart Define. "sill thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/sill/thesaurus/synonyms> |