statement has 7 distinct synonyms spread across 4 of its 7 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 message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc
“according to his statement he was in London on that day”
(music) the presentation of a musical theme
“the initial statement of the sonata”
a nonverbal message
“a Cadillac makes a statement about who you are”
the act of affirming or asserting or stating something
(computer science) a line of code written as part of a computer program
Synonyms, antonyms and the broader and narrower relations for statement come from Princeton University’s WordNet. Full sources and licences.