English linguistics has many specialties. Whereas semantics about sentence interpretation and syntax is about sentence formation, phonetics and phonology cover the field of sentence utterance. Phonetics is concerned with how the sounds are produced, transmitted and perceived whereas phonology is concerned with how sounds function in relation to each other in a language. In what follows we will discuss the meaning of both phonetics and phonology and show the difference between them in detail. Phonetics can be describe as the study of the minimal units that make up a language, and it is also a branch of linguistics that deals with the sounds of speech and their combination, production, description, and representation by written symbols- (1). There are three aspects of the study of speech sounds (phonetics). First aspect is articulatory phonetics; it is the study of production of speech sounds. Second one is acoustic phonetics, the study of the transmission and the physical properties of speech sound. Last one is auditory phonetics and it is about the study of the perception of speech sounds. Another point is that phonetics is able to describe the sounds because it can discovers and explain how speech sounds are produced and how can they used in spoken language. Not only that but it also can tell how we record it with written symbols and recognize the different sounds when we hear it. Phonology is a branch of linguistics which studies the speech sound and how