nurse has 12 distinct synonyms spread across 3 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.
try to cure by special care of treatment, of an illness or injury
“He nursed his cold with Chinese herbs”
serve as a nurse; care for sick or handicapped people
treat carefully
“He nursed his injured back by lying in bed several hours every afternoon”
one skilled in caring for young children or the sick (usually under the supervision of a physician)
Synonyms, antonyms and the broader and narrower relations for nurse come from Princeton University’s WordNet. Full sources and licences.