1
starting point
1
stay(noun, beam, shaft, pole, pillar)
1
stereobate
1
stringer(noun, beam, shaft, letdown, pole)
1
strip(noun, beam, shaft, pole, pillar)
1
stylobate
1
substratum
1
substruction
1
substructure
1
summer
1
terra firma
1
tie(noun, beam)
1
timber(noun, beam, shaft, letdown, pole)
1
trestle(noun, beam, shaft, pole, pillar)
1
truss(noun, beam)
1
two-by-four(noun, beam, shaft, letdown, pole)
1
underbuilding
1
undercarriage
1
undergirding
1
underpinning
11 years ago|3.1k views|share |citing 
APASmart Define. (2015). sill thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sill/thesaurus/synonyms
ChicagoSmart Define. 2015. "sill thesaurus" https://smartdefine.org/sill/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, sill thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sill/thesaurus/synonyms>.
MLASmart Define. "sill thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/sill/thesaurus/synonyms>