The document discusses morphosyntax, which is the study of grammatical categories or properties that have both morphological and syntactic characteristics. Some examples of morphosyntactic categories include number, tense, person, and voice. Morphology is the study of word structure and classification, while lexicology is the study of vocabulary. A morpheme is the smallest meaningful linguistic unit, and can be free-standing or bound within words. Morphemes are further classified by their position and function, such as prefixes, suffixes, and infixes.