cartridge has 2 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.
ammunition consisting of a cylindrical casing containing an explosive charge and a bullet; fired from a rifle or handgun
a light-tight supply chamber holding the film and supplying it for exposure as required
a module designed to be inserted into a larger piece of equipment
“he loaded a cartridge of fresh tape into the tape deck”
an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable
Synonyms, antonyms and the broader and narrower relations for cartridge come from Princeton University’s WordNet. Full sources and licences.