Accent
When linguists talk about “accent” they’re talking about *how* people say things rather than *what* things people say.
Style (Speaking Style)
People’s speaking styles are all the ways that they adjusts their speech to fit different situations.
Grammar
Linguists use the term grammar differently from most English teachers. To a linguist, “grammar” refers to the rules that speakers unconsciously follow when they put together strings of words to create sentences.
Vocabulary
In many ways, the vocabulary or lexicon is the most intuitive feature of a dialect. In the past, much dialect research was based on differences in vocabulary alone.