Labiodental frictives?
f and v
interdental frictives?
θ and ð
alveolar frtictives
s and z
palatal frictives
ʃ and ʒ
glottal frictive
h
frictive consonants
Fricatives are produced by forcing the breath stream (whether voiced or voiceless) through a narrow channel, or constriction, in the vocal tract.