A dialect is distinguished by its vocabulary, grammar, and pronunciation (phonology, including prosody). Where a distinction can be made only in terms of pronunciation (including prosody, or just prosody itself), the term accent may be preferred over dialect. Other types of speech varieties include <answer>jargons</answer>, which are characterized by differences in lexicon (vocabulary); slang; patois; pidgins; and argots.
What term is sometimes used for dialects that only differ in vocabulary?
jargons