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bulb has 7 distinct synonyms spread across 2 of its 6 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.
electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity
Synonyms, antonyms and the broader and narrower relations for bulb come from Princeton University’s WordNet. Full sources and licences.
a rounded part of a cylindrical instrument (usually at one end)
“the bulb of a syringe”
anything with a round shape resembling a teardrop
lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
“the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning”
a rounded dilation or expansion in a canal or vessel or organ