Relexification

In linguistics, relexification is a mechanism of language change by which one language changes much or all of its lexicon, including basic vocabulary, with the lexicon of another language, without drastically changing the relexified language's grammar. The term is principally used to describe pidgins, creoles, and mixed languages.^[1][2][3]

Relexification is not synonymous with lexical borrowing, by which a language merely supplements its basic vocabulary with loanwords from another language.