What do you call words with identical spelling but different meaning and different pronunciation? A couple examples are bass and resume.
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They are homographs. Such words may or may not be pronounced the same. If you want to emphasise that your words are definitely not pronounced in the same way, you could say that they are heterophonic homographs.
Well, I would say "resume" doesn't qualify, as the different pronunciation is actually the French word "résumé" (note the accents, which do not appear in "native" English, and therefore there is no standard accent modifier key on a U.S. 104-key).
However, the term you are looking for is heteronym, defined here.