Syllables can fall on a continuum of prosodic prominence -- accented, stressed, full vowel, and reduced vowel (even lesser stress on an unstressed vowel). 

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Saliency is the prominence of a certain syllable through changes in volume, duration, or frequency. Prominent words and syllables bear pitch accents, and accented syllables hold lexical stress.

Saliency

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

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