Dialects and accents vary systematically between different groups of speakers. Dialects refer to differences in vocabulary, grammar and pronunciation between groups, while accent only refers to pronunciation differences. Dialects and accents vary based on geographical location, social class, educational background and occupation. They can differ phonologically in terms of accent, morphologically in word forms, syntactically in grammar, and semantically in vocabulary. Common dialects of English include various British dialects like Received Pronunciation and Cockney, as well as American dialects like General American, New York City English and Southern American English.