Now, here's a complicated linguistic story about a word that virtually nobody outside the world of music uses. You may think that flautist is just a more artistic, classy way of saying "flutist", but you'd be wrong. And nor is it merely an alternative spelling or pronounced the same way. Sit back, we're about to blow your minds with this one.
"Flutist" pronounced "floo-tist" is actually an older word, dating back to the 1600s, whereas flautist, pronounced "floor-tist", doesn't appear anywhere until 1860 where it appears in a fictional novel based in Italy. So, it's not more high-society, it's not more historically accurate, and it's not more accurate as a description of the instrument. But it is pronounced a different way, so make sure you choose the right way of saying it for the version you prefer.