Phonology is a specialized branch of linguistics; phonologists are experts in this narrow field. If you're interested in how sounds are organized in languages, consult a phonologist.
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Sound Patterns
Phonologists study patterns of sounds, not individual sounds, to understand how they work together in languages. The phonologist explained how the pattern of stress and intonation varies between languages.
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Regional Dialects
Phonologists can explain differences in pronunciation among regional dialects of the same language. A phonologist compared the pronunciation of 'car' in various English dialects.