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sill Synonyms
Another word for sill
Looking for synonyms for sill? Sourced from our comprehensive thesaurus, here is a list of similar words and another word for sill, organized by relevance and context.
• noun (Context 1)
A horizontal piece of wood, stone, or metal forming the bottom of a window frame or doorway.
Usage Example
"She arranged a row of small potted succulents along the sunny window ledge."
Strongest
ledge
Strong
threshold
• noun (Context 2)
A strong horizontal structural member, such as a beam or timber, serving as the lowest foundation element of a wall, house, or bridge.
Usage Example
"The carpenters had to replace the rotted oak beam before they could begin framing the new exterior wall."
Weak
beam
foundation
joist
• noun (Context 3)
A tabular sheet of igneous rock intruded horizontally between and parallel with the existing strata of older rock.
Usage Example
"The Whin intrusion in northern England is a prominent geological formation composed of ancient dolerite."
Strong
intrusion
Opposites of sill
Looking for antonyms? The opposite of sill varies depending on the context. Here are a few common opposites:
dike
• Nearby Words
Cite this Entry
Wordmom. (2026). Synonyms for Sill. In Wordmom Thesaurus. Retrieved Oct 15, 2026, from https://wordmom.com/synonyms/sill