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[–] 17997838? 0 points 1 point (+1|-0) ago 

Well both words are spelled malus but they are different words, pronounced differently with different etymology. The us/um is not a difference - that is the same thing for both, just nominative vs accusative forms.

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[–] 17998235? ago 

oh, i thought one was neuter and the other was ... fem/masc, i don't remember. mb.