Linguistics should be considered as the study of Avestan, Iranian and Sanskrit languages; Languages that are the basis of Indo-European languages. The main function of language is to communicate, that is, to transfer information from one person to another. The aim of the present study is etymological and phonological study of 174 thousand words from the entries of the 12-volume set of Lexicon Encyclopedia of Noghabaei acronymed LEON. The method of the present study is census; That is, the sample includes the entire statistical population, which is equal to 174,000 English words done over a period of 16 years. Findings obtained through etymology and phonology indicate that about ninety percent of the words in English (including Latin, German, Greek, Slavic, etc.) are of Iranian origin, or better to say "Aryan". Therefore, the concept of "Proto=Indo-European Language" on the one hand and the concept of "Indo-European Language" on the other hand cannot be an utter umbrella for this language family and instead "Proto-Aryan language" and "Aryan Language" are suggested. In addition, existing domestic and foreign educational systems cannot have deep efficiency due to lack of correct knowledge of etymology and morphology, which despite the knowledge, several languages of this family simultaneously in a training course can be learned and taught and beyond that, the way of looking and worldview of four billion people towards life will be changed respectfully.