Studying lexicography is essential because it makes it possible to produce precise, userfocused dictionaries that improve communication and language competency. In addition to facilitating translation and digital language technologies, it provides a basis for language preservation, standardisation, and educational advancement. The Axomia Sadri language, an Indo-Aryan language that is an essential lingua franca for the "tea tribes" (Adivasi population) in Assam, is the subject matter of the study. The study details the Axomia Sadri language, which is in danger of becoming extinct due to its strong impact from Assamese and other prominent languages. The research comprises a grammatical sketch that covers the syntax, morphology, and phonology of the language. The core output of the work is "A Learner's Dictionary of Axomia Sadri," a monolingual dictionary with English glosses containing 400 words. The study emphasises the importance of this kind of documentation for revitalisation and preservation of minority language.