linger has 14 distinct synonyms spread across 4 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 one recorded opposite is rush.
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.
remain present although waning or gradually dying
“Her perfume lingered on”
be about
“The high school students like to loiter in the Central Square”
Synonyms, antonyms and the broader and narrower relations for linger come from Princeton University’s WordNet. Full sources and licences.