dot has 21 distinct synonyms spread across 6 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.
the United States federal department that institutes and coordinates national transportation programs; created in 1966
the shorter of the two telegraphic signals used in Morse code
street name for lysergic acid diethylamide
scatter or intersperse like dots or studs
“Hills constellated with lights”
Synonyms, antonyms and the broader and narrower relations for dot come from Princeton University’s WordNet. Full sources and licences.