When languages have a morpheme attached to the word that makes it a question, such as a suffix, is this called a question suffix, an interrogative, suffix, etc? I don't have much experience in morphology to know the terms used to label morphemes.

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Most often it is called an interrogative {particle/prefix/suffix}. There's no intrinsic reason for using the 25-cent word "interrogative" rather than "question", but "interrogative" is a fancy-register word.

  • Probably, the reason of using interrogative in favor of question is that the latter may imply the entire sentence, while former denotes only a morpheme or another grammatic feature. Commented Mar 1, 2015 at 20:29

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