Both these linking words mean the same. Although is more common in written English, and though is more common in spoken English. Both words connect two clauses (subject + verb (+ object). Although it rained a lot, we had a lot of fun on holiday. We had a lot of fun on holiday, though it would have been better if it hadn't rained so much. It's also quite common to end a sentence with though in spoken English to contrast with the previous sentence. The film was OK. It wasn't great, though.
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