Thesaurus

(n) : a loud, emphatic, exclamation of extreme emotion, usually horror, fear, excitement et cetera. Can be the exclamation of a word, but is usually a sustained, high-pitched vowel sound, particularly /ae/ or /i/, in any case, the loudest and most emphatic sound a human can make tends to be a scream. The term is not generally applied to sounds made by non-humans; a form of singing associated with the metal and screamo styles of music. It is a loud, rough, distorted version of the voice; rather than the normal voice of the singer

(v) : to make the sound of a scream; to move quickly; to race