Open English Wordnet
Nouns
(n)question, interrogation, interrogative, interrogative sentencea sentence of inquiry that asks for a reply“he asked a direct question”, “he had trouble phrasing his interrogations”
(n)doubt, dubiousness, doubtfulness, questionuncertainty about the truth or factuality or existence of something“the dubiousness of his claim”, “there is no question about the validity of the enterprise”
Verbs
(v)question, oppugn, call into questionchallenge the accuracy, probity, or propriety of“We must question your judgment in this matter”
(v)interrogate, questionpose a series of questions to“The suspect was questioned by the police”, “We questioned the survivor about the details of the explosion”