unvoiced or voiceless; utilizing the breath exclusively in the production of a speech sound
a vowel articulated with a relatively large opening above the tongue or with a relatively large oral aperture
a voiced sound that is less sonorous than a vowel but more sonorous than a stop or fricative and that may occur as either a sonant or a consonant, as (l, r, m, n, y, w)
articulated with the back of the tongue held close to or touching the soft palate
any sound other than the sound of greatest sonority in a syllable