... important issue in using morphological an-alyzers for morphological disambiguation is whathappens to unanalyzed words, i.e., words that re-ceive no analysis from the morphological analyzer.These ... accuracy rates on all tasks in thehigh nineties.1 IntroductionArabic is a morphologically complex language.1The morphological analysis of a word consists ofdetermining the values of a large ... specified morphological analyses, i.e., mor-phological tags, of which about 2,200 are actuallyused in the first 280,000 words of the Penn ArabicTreebank (ATB). In contrast, English morphological tagsets...