The sibling pson tsOne The child pzEre tzeere The old person phLlo thLlO The dog puhor tuhOre Table 2: Alternation of Masculine and Feminine forms in Sahidic Coptic (Lambdin 1988:1) The same effects can be seen within the Egyptian number system which, like the gender system, does not usually mark directly on the noun.
morphological irregularity within the classes of nouns is much more difficult to deal with.