report has 13 distinct synonyms spread across 8 of its 13 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.
a written document describing the findings of some individual or group
“this accords with the recent study by Hill and Dale”
the act of informing by verbal report
“he heard reports that they were causing trouble”
a short account of the news
“the report of his speech”
a sharp explosive sound (especially the sound of a gun firing)
“they heard a violent report followed by silence”
a written evaluation of a student's scholarship and deportment
“his father signed his report card”
an essay (especially one written as an assignment)
“he got an A on his composition”
the general estimation that the public has for a person
“he acquired a reputation as an actor before he started writing”
announce as the result of an investigation or experience or finding
“Dozens of incidents of wife beatings are reported daily in this city”
make known to the authorities
“One student reported the other to the principal”
complain about; make a charge against
“I reported her to the supervisor”
Synonyms, antonyms and the broader and narrower relations for report come from Princeton University’s WordNet. Full sources and licences.