This document discusses categorizing words in minimalist syntax. It begins by outlining traditional criteria for assigning words to grammatical categories based on their semantic, morphological, and syntactic properties. Morphologically, nouns inflect for number while verbs have inflectional forms like past tense and third person singular. Syntactically, different categories occupy different positions. The document then discusses using words' morphological and syntactic properties to determine their category. While morphology provides initial clues, it is not always reliable due to irregularities and restrictions. Categorizing words precisely requires considering both their morphological and syntactic behavior.