Analysis of information sources in references of the Wikipedia article "Sibilant" in English language version.
Fricatives involve turbulent airflow caused by at least two articulators being closed together. There are two main kinds, sibilants, which are high-pitched fricative sounds, and non-sibilants, which have a low-pitched sound. The sibilants in English are /s, z, ʒ, ʃ, ʒ/. The non-sibilants are /f, v, θ, ð, h/.
A substet of consonants, the production of which includes some amount of frication, is assigned the feature [+sibilant]. These consonants are /s, z, ʒ, tʃ, dʒ/. Some linguists also refer to them as stridents. The two terms are used interchangeably.