Synonyms of 'duct'
a big air duct in the ceiling
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A canal is a long, narrow stretch of water that has been made for boats to travel along or to bring water to a particular area.
A blockage of the canal could severely affect international shipping.
A channel is a passage along which water flows.
Keep the drainage channel clear.
Thesaurus for duct from the Collins English Thesaurus
A duct is a pipe, tube, or channel which carries a liquid or gas.