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canal has 5 distinct synonyms spread across 2 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
“the tear duct was obstructed”
Synonyms, antonyms and the broader and narrower relations for canal come from Princeton University’s WordNet. Full sources and licences.
long and narrow strip of water made for boats or for irrigation