I don't have a problem with such questions being asked, although they are often prime candidates for closure as general reference. That fate can be avoided, though, with further clarification about why the question is being asked, coupled with prior research.
For example, for something as straightforward as:
"Is advise a noun?"
I'd expect to see something like references to (or excerpts from) reputable dictionaries, along with published quotes that use the word incongruously with those definitions. In other words, the question may have a simple answer, but the O.P. should take pains to present it as a worthy and thought-provoking question.
(Such wrinkles often exist, and sometimes motivate questions that seem rather basic on the surface; however, it seems that O.P.s don't always do the best job of explaining those vindicating factors up front, and opt for vague brevity instead.)