examination has 7 distinct synonyms spread across 5 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.
the act of examining something closely (as for mistakes)
a set of questions or exercises evaluating skill or knowledge
“when the test was stolen the professor had to make a new set of questions”
formal systematic questioning
a detailed inspection of your conscience (as done daily by Jesuits)
the act of giving students or candidates a test (as by questions) to determine what they know or have learned
Synonyms, antonyms and the broader and narrower relations for examination come from Princeton University’s WordNet. Full sources and licences.