Speech sound classified according to its manner of articulation, in which at least one closure is formed with the glottis or in the oral cavity: (a) glottal stop ; (b) nasals2 [m], [n]; (c) plosives1 [p], [t], [b], [d]; (d) implosives1,; (e) ejectives [p’]; (f) clicks,. A plosive in which the stop is formed orally and released without friction is called an explosive sound. If the oral release occurs during the formation of non-nasal oral stops (in the cases of (c)-(f)) with friction, then they are called affricates.