British linguists distinguish dialect from accent, which refers only to pronunciation. Thus, any educated English speaker can use the vocabulary and grammar of Standard English, but different speakers use their own regional accent, or Received Pronunciation, which within the U.K. is considered an accent distinguished by class rather than by region. American linguists, however, include pronunciation differences as part of the definition of regional or social dialects (better called varieties).
The following are portmanteaus devised to describe certain local variants of English. Although similarly named, they are actually quite different in nature, with some being genuine mixed languages, some being instances of heavy code-switching between English and another language, some being genuine local dialects of English used by first-language English speakers, and some being non-native pronunciations of English. A few portmanteaus (such as Greeklish and Pinglish) are transliteration methods rather than any kind of spoken variant of English.
Accents of English from Around the World Hear and compare how the same 110 words are pronounced in 50 English accents from around the world - instantaneous playback online
American Languages: Our Nation's Many Voices: An online audio resource presenting interviews with speakers of German-American and American English dialects from across the United States.