label has 5 distinct synonyms spread across 3 of its 9 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.
assign a label to; designate with a label
“These students were labelled `learning disabled'”
attach a tag or label to
“label these bottles”
Synonyms, antonyms and the broader and narrower relations for label come from Princeton University’s WordNet. Full sources and licences.
distinguish (as a compound or molecule) by introducing a labeled atom
distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions
a brief description given for purposes of identification
“the label modern is applied to many different kinds of architecture”
trade name of a company that produces musical recordings
“the artists and repertoire department of a recording label is responsible for finding new talent”
a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction
an identifying or descriptive marker that is attached to an object