Isura Oro Yoruba: A Comprehensive Yoruba Thesaurus is the first thesaurus of the Yoruba language and the first descriptive thesaurus compiled for any African language. More than a word list, it explores how words connect, evolve, and gain nuance through Yoruba’s rich semantic relationships. Featuring hundreds of entries, it classifies synonyms into absolute, partial, and near equivalents, offering an exemplary model for African lexicography. The book not only presents systematic methods of analysis but also investigates the diverse factors that shape synonymy in Yoruba. An essential resource for learners, translators, writers, and researchers, Isura Oro Yoruba includes hypernyms, phonological variants, and clear explanations of interrelated meanings. It combines practical vocabulary guidance with a celebration of Yoruba intellectual heritage, inviting readers to uncover word connections, trace meaning across registers, and engage with the language in new ways.