Diction and Accent

Diction is one’s choice and use of words and phrases in speech or writing — in other words, almost the same as phraseology (a manner of expression, particularly one that’s characteristic of a particular speaker or writer). It can also mean the style of enunciation (the style of pronouncing words) in speaking or singing.

Diction is:

• A style of speaking or writing as dependent upon choice of words.
• The accent, inflection, intonation, and speech-sound quality manifested by an individual speaker, usually judged in terms of prevailing standards of acceptability; enunciation.

Pronunciation/ Accent is simply the way a given word is pronounced (the sound made for that word, and this sound may be in the correct way or something else).

Therefore, diction and pronunciation/ Accent are essentially different things, but they have a certain degree of overlap