al Mastizu nouns are marked for number. Singular is the root form of the noun, and plural is marked with the suffix -aans.
If a noun ends in a vowel, i becomes y, u becomes w and a is lost in the plural.
Definite nouns are marked with the article al. This does not vary with gender or number, as in Spanish, or with its phonological environment, as in Arabic. Indefinite nouns are unmarked.