Et is br-ch of Ling studying the origin of Ws, their change & devel-nt, the ling-c & extraling-c forces modifying their str-re, Mg & usage. The term Et derived from Gr “etymon” (true original Mg). Acc 2 the et principle the Voc is derived in2 2 uneven classes: native(30%),borrowed(70%). Native Ws make up the greatest part of basic W stock (the stable stock of the most freq-ly used 3-4 th Ws (the core of Voc), the changes there R slow a& R’t easy perceptable). Ws adopted from other lang-s - Bs. NatWs have a higher freq-cy value than most of the Bs. They form the foundation of the EVoc & mb found in any spoken/written Spch. The NatWs includes most of the conjunctions, numerals, prep-s, proNs & the strong verbs, def-t/indef-t articles. The native element is mainly monosyllabic, but 4 the Mg NatWs R mainly polysem-c, having great WBing power & making up the majority of set expressions & proverbs (#milk-milky-milkman). Acc 2 their origin NatWs mb devided in2 3 groups: indo-european,common-germanic,English-proper. Of IE origin are the oldest, having correlations to every IE language (#father,wolf, nose,sun,day,to be,quick,1-100). Of CG stuck -//- in every germ. lang, constituting a large prt of the native Ws (head,hand,SEASONS,WEATHER,HOUSE,ANIMALS). EP Ws have no equival-s in other lang-s (girl,lady,queen,always).