Both signal that expectations raised by the preceding statement will be confounded to some extent by the following statement. Do they differ in any way, e.g. by the extent of the confounding they signal?
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Take a look at What is the difference between but and however?. You should search the web before posting here. – MikeJRamsey56 Jun 30 '17 at 17:56
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related: “However” vs. “but” — which is more formal? and “However” vs. “but” – Mari-Lou A Jun 30 '17 at 18:08
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"However" is not a conjunction; it's an adverb. – Laurel Jun 30 '17 at 22:34
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It's not that simple. The only difference between but and however is that but is a coordinating conjunction (but means and, plus surprise), while however and its ilk are subordinating conjunctions. Most subordinating conjunctions are adverbial. – John Lawler Jun 30 '17 at 23:09
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"But" is a coordinator (coordinating conjunction) that conveys "and" together with some further, non-propositional, meaning -- usually an adversative one. By contrast, "however" is an adverb that typically functions as a connective adjunct, as in "Ed noticed the problem; Liz, however, missed it". – BillJ Jul 1 '17 at 9:02
