words have vowels and consonant sounds, but when we speak, we also stress particular syllables of a word, and also speak with a tone, such as angy, or, light-hearted(happy), or sombre(sad). Tone and stress are the suprasegmental aspects of speech.
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The suprasegmental features are those which operate over longer stretches of speech, such as, stress, rhythm, intonation, pitch, and voice quality as opposed to the segmental features which are referred to as the individual sounds.