Lexicology is the branch of linguistics that deals with the lexical component of language.
The lexicon holds information about the phonetic, phonological, syntactic, semantic and pragmatic properties of words and consequently has a central role in these levels of analysis. It is also a major area of investigation in other areas of linguistics, such as psycholinguistics, typological linguistics and language acquisition. Lexicology is concerned with the nature of the vocabulary and the structure of the lexicon; and lexicography applies the insights of lexicology, along with those of other linguistics disciplines, to the study of dictionaries and lexicons.
Lexicology, on the other hand, is the branch of descriptive linguistics concerned with the linguistic theory and methodology for describing lexical information, often focussing specifically on issues of meaning. Traditionally, lexicology has been mainly concerned with `lexis', i.e. lexical collocations and idioms, and lexical semantics, the structure of word fields and meaning components and relations. Until recently, lexical semantics was conducted separately from study of the syntactic, morphological and phonological properties of words, but linguistic theory in the 1990s has gradually been integrating these dimensions of lexical information.
2. The peculiar features of the English and Ukrainian vocabulary systems.
What all this points to is that English vocabulary is really a lot more complicated - and therefore a lot more difficult to learn - than the vocabularies of some other languages. English vocabulary is exceptionally large, and to be fluent in English, you need to have a command of many more words than is the case in some other languages. Furthermore, English is unusual in that it uses word formation systems that are a great deal more complex than those you find in many other