cruise has 1 distinct synonym spread across 1 of its 5 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.
drive around aimlessly but ostentatiously and at leisure
“She cruised the neighborhood in her new convertible”
travel at a moderate speed
“Please keep your seat belt fastened while the plane is reaching cruising altitude”
Synonyms, antonyms and the broader and narrower relations for cruise come from Princeton University’s WordNet. Full sources and licences.
look for a sexual partner in a public place
“The men were cruising the park”
sail or travel about for pleasure, relaxation, or sightseeing
“We were cruising in the Caribbean”