Take free will as an example. To my knowledge, many compatiblists (free will and determinism are compatible) and people who deny that free will exist do not disagree on anything other than what the correct label for their position is. I imagine the same can often be said about nihilism.
Indeed, Hume, perhaps the most famous compatibilist, denies the existence of free will in his Treatise, only advocating compatibilism later, in the Enquiry Concerning Human Understanding. It certainly seems to me that he doesn't actually change his mind; his early position seems to be "this thing people call free will is incoherent, so we should talk about things that matter instead," and his later position seems to be "people won't stop talking about free will, so I'll call the things that matter free will and reject the incoherent stuff under some other label (indifference)."
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous thread is at close to 500 comments.