question has 16 distinct synonyms spread across 10 of its 11 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. Its one recorded opposite is answer.
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.
an instance of questioning
“there was a question about my training”
uncertainty about the truth or factuality or existence of something
“the dubiousness of his claim”
an informal reference to a marriage proposal
“he was ready to pop the question”
challenge the accuracy, probity, or propriety of
“We must question your judgment in this matter”
pose a series of questions to
“The suspect was questioned by the police”
Synonyms, antonyms and the broader and narrower relations for question come from Princeton University’s WordNet. Full sources and licences.