1. Lexicography

Applied linguistics is an interdisciplinary field which identifies, investigates, and offers solutions to language-related real-life problems. 

45.Cognitive grammar	Cognitive grammar is unorthodox with respect to generative grammars and American structuralism.	Cognitive grammar is a cognitive approach to language developed by Ronald Langacker, which hypothesizes that grammar, semantics, and lexicon exist on a continuum instead of as separate processes altogether
46.Structural linguistics	Structural linguistics begins with the posthumous publication of Ferdinand de Saussure's Course in General Linguistics in 1916, which his students compiled from his lectures.	Structural linguistics, or structuralism, in linguistics, denotes schools or theories in which language is conceived as a self-contained, self-regulating semiotic system whose elements are defined by their relationship to other elements within the system
47.Etymology	The word etymology derives from the Greek word ἐτυμολογία (etumología), itself from ἔτυμον (étumon), meaning "true sense or sense of a truth", and the suffix -logia, denoting "the study of"	Etymology (/ˌɛtɪˈmɒlədʒi/)^[1] is the study of the history of the form of words^[2] and, by extension, the origin and evolution of their semantic meaning across time.^[3] It is a subfield of historical linguistics, and draws upon comparative semantics, morphology, semiotics, and phonetics.
48.Functional linguistics	Linguistic functionalism spawned in the 1920s to 1930s from Ferdinand de Saussure's systematic structuralist approach to language (1916).