Synonyms and related words :
affright, alarm, amaze, ambush, astound, awe, awestrike, bedaze, bedazzle, bewilder, boggle, bowl down, bowl over, bushwhack, catch off-guard, catch unawares, come from behind, come upon unexpectedly, confound, daze, dazzle, do the unexpected, drop in on, dumbfound, dumbfounder, flabbergast, floor, overwhelm, paralyze, perplex, petrify, pounce upon, pull up short, shock, spring a surprise, spring upon, stagger, startle, strike dead, strike dumb, strike with wonder, stun, stupefy, surprise, take by surprise, take short, take unawares, terrify