FWIW, I always considered "dialect" to imply slightly different grammatical structures, vocabulary, idiomatic expressions.
Then again, I am italian, to me most of the english speaking world appear to be just "accents".
Anyway, wikipedia appears to agree that pronounciation only does not make a "dialect".
"""
A dialect is distinguished by its vocabulary, grammar, and pronunciation (phonology, including prosody). Where a distinction can be made only in terms of pronunciation (including prosody, or just prosody itself), the term accent is appropriate, not dialect.
"""
Then again, I am italian, to me most of the english speaking world appear to be just "accents".
Anyway, wikipedia appears to agree that pronounciation only does not make a "dialect".
""" A dialect is distinguished by its vocabulary, grammar, and pronunciation (phonology, including prosody). Where a distinction can be made only in terms of pronunciation (including prosody, or just prosody itself), the term accent is appropriate, not dialect. """