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Could you please tell me if these kind of phrases express kind of a friendship among people doing e.g. drinking?

drinking companions
journey or travelling companions(I don't know if it is correct.)
working companions(I'm not sure about it too..)
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'Drinking companions' and 'travel companions' are both common. I think the third reference would more likely be 'co-worker'.
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Thanks dear Philip, but are they necessarily friend, or a random guy count too? I mean companion does companion in here bear specific meanings or not?