What English words containing only voiced or only unvoiced consonants contain the most?
Count each consonant as many times as it appears.
Note that this is a question about the sounds (phonemes) contained in spoken English words, not letters of the alphabet!
Consonants are either voiced (spoken with vibration of the vocal cords) or unvoiced (spoken without it). For example the sounds usually represented by b, d and v are voiced, whereas those usually represented by p, t and f are unvoiced. Voiced consonants can convey a feeling of softness; unvoiced ones, strength.
Captious contains 4 consonants, all unvoiced: /c/, /p/, /ʃ/, /s/.
Bamboozled contains 6, all voiced: /b/, /m/, /b/, /z/, /l/, /d/.
Can you do better?
/f/, /k/, /p/, /s/, /t/,
/tʃ/ (chip) (count as single)
/v/, /g/, /b/, /z/, /d/,
/l/, /m/, /n/, /r/, /w/, /y/,
/dʒ/ (gem) (count as single)
Let's pronounce where and wear the same. /hw/ is an unvoiced-voiced pair and therefore could not appear in the words we want anyway, and we will ignore /ʍ/, the unvoiced partner of /w/ that appears in some people's pronunciation of where.