The term "wh-question" seems transparent enough for English speakers, but reeks of English language chauvinism. I have heard such questions referred to as "information questions," "content questions, and "question-word questions," but I don't know what synonym or synonymous phrase for "wh-question" is most commonly used among professional linguists these days. I haven't been able to find an answer to my question.
Since my hobby is writing reference grammars for imaginary languages, an answer to this question will be useful for me.