Due to the preference for the use of primitive sounds in speech and the provision of a scientific and reasoned definition in auditory phonology, it is necessary to define and explain two contrasting processes of sound combination and decomposition for the comparative study of the sounds in several different languages. Therefore, the present study aims to investigate the cognate words in Laki, Kurdish, and Persian languages under a contrastive phonetic process named combination or decomposition. The words containing primitive sounds that are therapeutic were investigated. According to the definition, primitive sounds are compound sounds of one or more components that decomposed in the evolution of the languages and still exist in the speech of more evolved languages such as Persian. Examples of such sounds are abundant in ancient languages. Sounds such as η, m, ɞ, owi, and owe can be among the top primitive sounds based on the phonetic studies with the investigation of the phonetic processes and principles in the present research..
