Common and proper nouns are open classes; the pronouns are closed.
Common nouns can refer to abstract or concrete items.
Stem nouns are those that are neither compounded nor derived.
Mass nouns refer to an undifferentiated aggregation rather than separate units. These cannot take numbers, except for a postpended xita one to denote the smallest individual piece of that aggregate.
This determines which derivational suffixes can be applied, and which pronouns are used as reference.
These refer to people and other multicellular organisms capable of independent movement.
These refer to things such as natural phenomena, plants, fungi and unicellular life.
This category encompasses concepts, ideas and other intangibles. They are referred to by inanimate pronouns.
The first part of a compound noun must be a noun, and the subsequent parts specify the meaning of that noun. These parts can be nouns or verbs. The whole noun is usually written without spaces. The syllabification and stress of nonce words are determined on a stem-by-stem basis. However, a compound in common use will start being treated whole.
Proper nouns begin with a capital letter in the transliteration. These are names that refer to individual people, places or things.