Lexicology
Lexicology is the branch of linguistics that analyzes the lexicon of a specific language. A word is the smallest meaningful unit of a language that can stand on its own, and is made up of small components called morphemes and even smaller elements known as phonemes, or distinguishing sounds. Lexicology examines every feature of a word – including formation, spelling, origin, usage, and definition. Lexicology also considers the relationships that exist between words. In linguistics, the lexicon of a language is composed of lexemes, which are abstract units of meaning that correspond to a set of related forms of a  word. Lexicology looks at how words can be broken down as well as identifies common patterns they follow. Lexicology is associated with lexicography, which is the practice of compiling dictionaries. Etymology. The term "lexicology" derives from the Greek word λεξικόν "lexicon" (neuter of λεξικός "lexikos", "of or for words", from λέξις "lexis", "speech" or "word") and -λογία "-logia", "the study of" (a suffix derived from λόγος "logos", amongst others meaning "learning, reasoning, explanation, subject-matter"). Etymology as a science is actually a focus of lexicology. Since lexicology studies the meaning of words and their semantic relations, it often explores the  history and development of a word. Etymologists analyze related languages using the comparative method, which is a set of techniques that allow linguists to recover the ancestral phonological, morphological, syntactic, etc., components of modern languages by comparing their cognate material. This means many word roots from different branches of the Indo-European language family can be traced back to single words from the Proto-Indo-European language. The English language, for instance, contains more borrowed words (or loan words) in its vocabulary than native words. Examples include "parkour" from French, "karaoke" from Japanese, "coconut" from Portuguese, "mango" from Hindi, etc . A lot of music terminology, like "piano", "solo", and "opera", is borrowed from Italian. These words can be further classified according to the linguistic element that is borrowed: phonemes, morphemes, and semantics. Approach. General lexicology is the broad study of words regardless of a language's specific properties. It is concerned with linguistic features that are common among all languages, such as phonemes and morphemes. Special lexicology, on the other hand, looks at what a particular language contributes to its vocabulary, such as grammars. Altogether lexicological studies can be approached two ways: These complementary perspectives were proposed by Swiss linguist  Ferdinand de Saussure. Lexicology can have both comparative and contrastive methodologies. Comparative lexicology searches for similar features that are shared among two or more languages. Contrastive lexicology identifies the linguistic characteristics which distinguish between related and unrelated languages. Semantics. The subfield of semantics that pertains especially to lexicological work is called lexical semantics. In brief, lexical semantics contemplates the significance of words and their meanings through several lenses, including synonymy, antonymy, hyponymy, and polysemy, among others. Semantic analysis of lexical material may involve both the contextualization of the word(s) and syntactic ambiguity. Semasiology and onomasiology are relevant linguistic disciplines associated  with lexical semantics. A word can have two kinds of meaning: grammatical and lexical. Grammatical meaning refers to a word's function in a language, such as tense or plurality, which can be deduced from affixes. Lexical meaning is not limited to a single form of a word, but rather what the word denotes as a base word. For example, the verb "to walk" can become "walks", "walked", and "walking –" each word has a different grammatical meaning, but the same lexical meaning ("to move one's feet at a regular pace"). Phraseology. Another focus of lexicology is phraseology, which studies  multi-word expressions, or idioms, like 'raining cats and dogs.' The meaning of the phrase as a whole has a different meaning than each word does on its own and is often unpredictable when considering its components individually. Phraseology examines how and why such meanings exist, and analyzes the laws that govern these word combinations. Idioms and other phraseological units can be classified according to content and/ or meaning. They are difficult to translate word-for-word from one language to another.