Nouns in Ǣdyihòzhn come in five classes: inanimate, valuable, animate, masculine, feminine. A noun's class is determined mainly by semantics rather than by the form of the word, which is to say that there is no way of predicting a noun's class merely by hearing or seeing it. Each noun class, however, interacts differently with other elements of a sentence.
While there are a number of exceptions, each class can be broadly defined as follows:
Ǣdyihòzhn has an inalienably-possessive case ending -èn for words ending in a consonant, -n for those ending in a vowel. Adjectives originally formed from nouns in this case tend to use -n in both environments.
Ǣdyihòzhn nouns are not marked for number; by themselves they can indicate either singular or plural. Should some indication of number need to be specified, nouns take classifiers, somewhat as in the English examples “five head of cattle”, “three sheets of paper”, “eight drops of water”. Unlike English, however, this applies to all nouns and is in most cases mandatory; omitting a classifier is ungrammatical.