Dialect

Solecism

Grammatical mistake in speech or writing

Accent

Refers only to differences in pronunciation between one variety of language and another.

Dialect

Refers to all the difference between one variety of a language, pronunciation, word usage and syntax.

Lexical

Relating to items of vocabulary in a language

Non-standard dialect

Is a dialect that does not have the institutional support or sanction that a standardized dialect has.

Mutually intelligible

Is the understanding of a language between the participants in the act of speaking.

Vulgar

Spoken by or expressed in language spoken by the common people. Vernacular.

Phonological

The study of speech sounds in a language.

Syntax

The study of the rules whereby words or other elements of sentence structure are combined to form grammatical sentences.

Elicit

To arrive at a conclusion by logic

Utterance

a complete unit of talk, bounded by the speaker's silence.