Exclamation, Scream, Shout
noun, verbal noun
Extinction caused by a shout. You are making everyone else's voices go extinct, and you scream and shout over them. You are making an exclamation, gosh darn it.
ぜっきょう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Careful of the shortening.
誰かがジェットコースターの上で、「覚悟しろ！」と絶叫した。
Someone screamed "brace yourself!" on the roller coaster.