Noun
paralexicon (plural paralexica)
A parallel set of vocabulary within a language, e.g. a formal register, ritual language or secret cant, code switching
A frequent function of the paralexicon is secrecy. […] Sometimes the paralexicon is acquired during childhood as a first language, Ma'a [a paralexicon of Mbugu] for example. In many cases it is acquired later, such as registers of respect, initiation languages and languages created by adolescents.Norval Smith & Tonjes Veenstra (2001) Creolization and Contact, p. 121–122.