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Synonyms for Wit (same or very similar meaning)

WordNet sense 1 (a witty amusing person who makes jokes):
card, wag

WordNet sense 2 (a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter):
humor, witticism, wittiness, humour

WordNet sense 3 (mental ability):
brain, mentality, brainpower, learning ability, mental capacity

From the ODE community, based on WordNetadd/edit