רָעַם râʻam (H7481)

to tumble, i.e. be violently agitated; specifically, to crash (of thunder); figuratively, to irritate (with anger)

1) to thunder 1a) (Qal) 1a1) to make the sound of thunder, thunder 1a2) to rage 1b) (Hiphil) 1b1) to thunder, cause thunder 1b2) to tremble, cause to tremble (by extension)

a primitive root;