magnetic has 3 distinct synonyms spread across 2 of its 5 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. Its 3 recorded opposites are antimagnetic, nonmagnetic, geographic.
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.
having the properties of a magnet; i.e. of attracting iron or steel
“the hard disk is covered with a thin coat of magnetic material”
capable of being magnetized
determined by earth's magnetic fields
“magnetic north”
1 of the 5 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for magnetic.
Synonyms, antonyms and the broader and narrower relations for magnetic come from Princeton University’s WordNet. Full sources and licences.