panic
noun
an overwhelming feeling of fear and anxiety
sudden mass fear and anxiety over anticipated events
“panic in the stock market”
“a war scare”
Synonymsscare
verb
be overcome by a sudden fear
“The students panicked when told that final exams were less than a week away”
cause sudden fear in or fill with sudden panic
“The mere thought of an isolation cell panicked the prisoners”
Source: WordNet 3.1, Princeton University