The word "嚎叫" is formed by combining the character "嚎", meaning to wail or howl, which uses the "口" radical for mouth-related sound and "豪" for phonetic approximation, with the character "叫", meaning to shout or call, also featuring the "口" radical and "丩" for phonetic guidance; their shared radical emphasizes vocalization, and their meanings merge to denote intense, loud crying or screaming.