As nouns the difference between pidgin and sociolect

is that pidgin is (linguistics) an amalgamation of two disparate languages, used by two populations having no common language as a lingua franca to communicate with each other, lacking formalized grammar and having a small, utilitarian vocabulary and no native speakers while sociolect is the variant of language used by a social group such as a socioeconomic class, an ethnic group, an age group, etc.