funnel has 1 distinct synonym spread across 1 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.
a conical shape with a wider and a narrower opening at the two ends
a conically shaped utensil having a narrow tube at the small end; used to channel the flow of substances into a container with a small mouth
Synonyms, antonyms and the broader and narrower relations for funnel come from Princeton University’s WordNet. Full sources and licences.
(nautical) smokestack consisting of a shaft for ventilation or the passage of smoke (especially the smokestack of a ship)
move or pour through a funnel
“funnel the liquid into the small bottle”