Features that distinguish dialects from each other can be found in lexicon (vocabulary) and grammar, as well as in pronunciation (phonology, including prosody). Where the salient distinctions are only or mostly to be observed in pronunciation, the more specific term "accent" may be used instead of "dialect". Differences that are largely concentrated in lexicon may be creoles in their own right. When lexical differences are mostly concentrated in the specialized vocabulary of a profession or other organization, they are jargons; differences in vocabulary that are deliberately cultivated to exclude outsiders or to serve as shibboleths are known as cryptolects (or "cant") and include slangs and argots. The particular speech patterns used by an individual are referred to as that person's idiolect. Dialects do not always correspond with a standard written system this is the case for most spoken dialects. For example, spoken dialects of the Arabic Language do not have their own writing system that is distinguishable from other dialects. However, these dialects are not always mutually intelligible from one another. For example, speakers of the Levantine Dialect of Arabic may have trouble understanding speakers of the Egyptian Dialect. This leads to some debate among scholars of the status of Arabic dialects as their own regionalects or their own separate languages. To classify subsets of language as dialects, linguists take into account linguistic distance.