interrogative has 5 distinct synonyms spread across 3 of its 4 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 declarative.
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.
some linguists consider interrogative sentences to constitute a mood
relating to the use of or having the nature of an interrogation
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for interrogative.
Synonyms, antonyms and the broader and narrower relations for interrogative come from Princeton University’s WordNet. Full sources and licences.