linguistics1-9  Exercise 1: Accent or Dialect?
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  (a) loch with final [x] or [k]   ACCENT (pronunciation only; same word).
  (b) wee instead of small         DIALECT (vocabulary).
  (c) I dinnae ken / I don't know  DIALECT (vocabulary and grammatical form,
                                   with a different pronunciation too, so
                                   accent is involved as well).
  (d) bath with short or long      ACCENT (pronunciation only; the same word
      vowel                        is pronounced differently in northern and
                                   southern England).

Test: if the words and grammar stay the same and only the sounds differ, it
is an accent. If the words or grammar differ too, it is a dialect. Dialect
differences usually come with an accent as well.