staff has 2 distinct synonyms spread across 2 of its 8 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.
personnel who assist their superior in carrying out an assigned task
“the hospital has an excellent nursing staff”
a strong rod or stick with a specialized utilitarian purpose
“he walked with the help of a wooden staff”
building material consisting of plaster and hair; used to cover external surfaces of temporary structure (as at an exposition) or for decoration
(music) the system of five horizontal lines on which the musical notes are written
serve on the staff of
“The two men staff the reception desk”
Synonyms, antonyms and the broader and narrower relations for staff come from Princeton University’s WordNet. Full sources and licences.