surd

(a) produced without vibration of the vocal cords
- unvoiced consonants such as "p" and "k" and "s"
unvoiced, voiceless, hard,

(n) a consonant produced without sound from the vocal cords voiceless consonant,

unvoiced voiceless hard voiceless consonant

sonant voiced soft

sura sure surf

sub Sue sum sun sup Sur Sus S.U.V. SUV

such suck suds suer suet Suez Sufi sugi suit Sula sulk sumo sump Sung sunk sura sure surf Susa Suva