Adverb

außerdem

besides, furthermore, in addition

Ich bin müde, außerdem ist es schon spät.

I am tired; besides, it is already late.

Das Hotel ist schön und außerdem billig.

The hotel is nice and furthermore cheap.

außerdem + verb + subject ... besides, ... I have no money, besides I have no time.

zudem, ferner

außer (outside/except) + dem (that [dative]) = outside of that

Think 'outside of them' -> besides them -> besides/furthermore.

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