harrison has 9 distinct synonyms spread across 4 of its 4 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.
English actor on stage and in films (1908-1990)
English rock star; lead guitarist of the Beatles (1943-2001)
23rd President of the United States (1833-1901)
9th President of the United States; caught pneumonia during his inauguration and died shortly after (1773-1841)
Synonyms, antonyms and the broader and narrower relations for harrison come from Princeton University’s WordNet. Full sources and licences.