finger has 5 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.
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“I fingered my boss and found that he is not logged on in the afternoons”
Synonyms, antonyms and the broader and narrower relations for finger come from Princeton University’s WordNet. Full sources and licences.
indicate the fingering for the playing of musical scores for keyboard instruments
any of the terminal members of the hand (sometimes excepting the thumb)
“her fingers were long and thin”
the length of breadth of a finger used as a linear measure
one of the parts of a glove that provides covering for a finger or thumb