scrap has 14 distinct synonyms spread across 5 of its 7 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 small piece of something that is left over after the rest has been used
“she jotted it on a scrap of paper”
Synonyms, antonyms and the broader and narrower relations for scrap come from Princeton University’s WordNet. Full sources and licences.
make into scrap or refuse
“scrap the old airplane and sell the parts”