Lexicology, the study of the structure, meaning, and development of words, is fundamental to understanding and mastering a language. This article evaluates the role of lexicology in English language learning by analyzing how lexical knowledge contributes to learners' linguistic competence, vocabulary expansion, and communicative ability. Through classroom observations, surveys, and lexical tests administered to EFL learners, the study identifies key challenges and pedagogical recommendations for integrating lexicological concepts into language instruction.