Sort of. When you point it out to a native English speaker, and give examples, it becomes obvious. But it often needs pointing out, because they can be used as

Sort of. When you point it out to a native English speaker, and give examples, it becomes obvious. But it often needs pointing out, because they can be used as synonyms. In this instance I’m saying “nice” is just giving pleasant vibes no matter what, and being kind is being friendly and supportive but not always being nice. If you put on clothes that don’t suit you it is nice to say that they do (because I want to keep things pleasant), but it’s kind to say something else suits you better (because I want the best for you, not to pretend everything is fine). Telling you they don’t suit you and leaving it at that is just mean: I haven’t helped you and now you feel bad. Worth noting the etymology for kind is from “kin”, meaning family. Family should want the best for you, and frame things in a way that can help you, even if they are telling you things that might not be pleasant. We need more kinship in modern life. Less “honesty”.