Naked and bare are both adjectives; bare can also be a verb. Jay compared naked as an adjective with bare as a verb, which is a bit confusing. Naked is usually used to describe an unclothed person, and it usually means 'completely without clothes'. Bare can be used to mean the same thing, but is more generally used to describe a partial lack of clothing - I currently have bare arms and legs. I am also bareheaded, i.e. I am not wearing a hat. As an adjective, bare is also often used to describe other things: a bare mountain has no trees; a bare living is a life with no luxuries; in computing, a bare metal server has no operating system.

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Naked just means without clothes or covering. So basically, you bathe or shower naked. Bare has several meanings. If you're bare naked, it means you are absolutely naked as in you have zero clothes on you. Bare can also mean empty or almost empty. For example, if you haven't done your grocery shopping for three weeks, your refrigerator will look bare because you'll have eaten all the food by then. However, I wouldn't use bare to describe liquids though. (i.e. That water bottle looks bare vs. That water bottle looks empty).