1. Lexicography

Variation is a characteristic of language: there is more than one way of saying the same thing. Speakers may vary pronunciation (accent), word choice (lexicon), or morphology and syntax (sometimes called "grammar").^[

32.Variety	The use of the word "variety" to refer to the different forms avoids the use of the term language, which many people associate only with the standard language, and the term dialect, which is often associated with non-standard varieties thought of as less prestigious or "correct" than the standard	In sociolinguistics, a variety, also called an isolect^[1] or lect, is a specific form of a language or language cluster.
33.Word stem	The term is used with slightly different meanings depending on the morphology of the language in question. In Athabaskan linguistics, for example, a verb stem is a root that cannot appear on its own, and that carries the tone of the word. Athabaskan verbs typically have two stems in this analysis, each preceded by prefixes.	In linguistics, a word stem is a part of a word responsible for its lexical meaning.
34.Dialect	The term dialect (from Latin dialectus, dialectos, from the Ancient Greek word διάλεκτος, diálektos 'discourse', from διά, diá 'through' and λέγω, légō 'I speak') can refer to either of two distinctly different types of linguistic phenomena:	One usage refers to a variety of a language that is a characteristic of a particular group of the language's speakers.^[1] Under this definition, the dialects or varieties of a particular language are closely related
35.Lexicology	The term lexicology derives from the Greek word λεξικόν lexicon (neuter of λεξικός lexikos, "of or for words",^[4] from λέξις lexis, "speech" or "word"^[5]) and -λογία -logia, "the study of" (a suffix derived from λόγος logos, amongst others meaning "learning, reasoning, explanation, subject-matter"