redundancy
: the act of using a word, phrase, etc., that repeats something else and is therefore unnecessary
: a word, phrase, etc., that repeats something else and is therefore unnecessary : a redundant word, phrase, etc.
: a part in a machine, system, etc., that has the same function as another part and that exists so that the entire machine, system, etc., will not fail if the main part fails.
Repetition is the simple repeating of a word, within a sentence or a poetical line, with no particular placement of the words, in order to secure emphasis. This is such a common literary device that it is almost never even noted as a figure of speech.
Jargon is a type of language that is used in a particular context and may not be well understood outside of it. The context is usually a particular occupation (that is, a certain trade, profession, or academic field), but any ingroup can have jargon.
Doublespeak is language that deliberately obscures, disguises, distorts, or reverses the meaning of words. Doublespeak may take the form of euphemisms (e.g., "downsizing" for layoffs, "servicing the target" for bombing[), in which case it is primarily meant to make the truth sound more palatable. It may also refer to intentional ambiguity in language or to actual inversions of meaning (for example, naming a state of war "peace"). In such cases, doublespeak disguises the nature of the truth. Doublespeak is most closely associated with political language.
Archaic may refer to a period of time preceding a "classical period":

slang WORDS
: words that are not considered part of the standard vocabulary of a language and that are used very informally in speech especially by a particular group of people.
Sexist language is language that excludes either men or women when discussing a topic that is applicable to both sexes. This includes using the word man to refer to humanity,