This paper presents a unified structural theory of parts of speech, integrating comparative evidence from English, Uzbek, and Russian. It addresses the longstanding debate on word-class categorization by combining distributional, syntactic, morphological, and semantic criteria into a comprehensive framework. Utilizing descriptive grammars and typological studies, we identify universally communicative "primary" parts of speech common across these languages, alongside "secondary" categories specific to individual linguistic structures. Our analysis emphasizes the importance of clearly distinguishing semantic and formal criteria to avoid theoretical ambiguity. The unified model effectively accounts for cross-linguistic variations, such as differing usage of articles, pronoun case systems, and morphological distinctions, ensuring theoretical coherence.

Parts of speech, structural linguistics, linguistic universals

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