kǒu​yinkǒu​yīn HSK7

accent

口音 kǒu​yin frequency
accent noun
a distinctive mode of pronunciation associated with a particular locality or social class

He speaks with a slight southern accent.

口音 kǒu​yīn
accent noun
(linguistics) oral speech sounds

The difference between oral and nasal sounds lies in whether the airflow passes through the nasal cavity during pronunciation.

Frequency

Movie subtitles
16.4 per million appears in 6% of films
Written text
4.98 per million

Details

HSK 2.0
Level 6
HSK 3.0
Level 7

Sources

Definitions
CC-CEDICT