Many lexical units of the language and their meanings need etymological analysis in relation to the origin and history of certain words. Etymology as a branch of lexicology explores the theoretical foundations and methodological improvement of the analysis. In order to find out the purpose of determining the origin and history of a certain word or words, it is necessary to find out: the primary meaning of some words, and in other words secondary, i.e. derived meanings, in third lexemes, the meaning of lexical phraseological phrases, in winged expressions, sayings and proverbs, as a result of collecting and analyzing materials and draw certain conclusions. The setting of such goals and objectives has existed since the formation of the science of language. Because the origin and history of words and their meanings interested the population for practical purposes, and scientists for scientific purposes. The main object of the research is the history of the semantics of words, so the article uses such techniques and methods as diachrony-synchrony, analysis-synthesis, induction-deduction, component and complex analysis of the retrospective method. The article takes into account all lexical, stylistic and grammatical meanings, grammatical forms in the form of root and derived morphemes, as well as semantics in the composition of lexical and stable word combinations of the common Turkic root words «hob», «bad». The analyses werecarried out and covered the linguistic materials of the Turkic written monuments and modern Turkic languages. Etymological analyses of the etymons «hob», «bad» are theoretically based on the 5 principles of etymological theory developed by us: word semantics – semantic derivation – derivational process – types of reconstruction and semantic reconstruction – comparative bases of word etymology. Etymological analysis of the words «hob», «bad» is carried out at the phonemic, morphemic, lexemic and syntagmatic levels, i.e. it is subjected to a comprehensive analysis. As a result of comprehensive consideration of the Turkic etymon «ot» in aspects of the semantics of root words, derived words semantics and the semantics of the complex words we can conclude that archiseme of the etymon «hob» – value is «hollow, convex», that archisemes of the etymon «bad»: in the Turkic languages «face», in Arabic «desert, thirst», in persian «bad».