panic

nouns

an overwhelming feeling of fear and anxiety
is derived from
sudden mass fear and anxiety over anticipated events
"panic in the stock market"; "a war scare"; "a bomb scare led them to evacuate the building"

verbs

be overcome by a sudden fear
"The students panicked when told that final exams were less than a week away"
is a type of (narrower)
be afraid or scared of; be frightened of
"I fear the winters in Moscow"; "We should not fear the Communists!"
cause sudden fear in or fill with sudden panic
"The mere thought of an isolation cell panicked the prisoners"
is a type of (narrower)
fill with terror; frighten greatly
causes
be overcome by a sudden fear
"The students panicked when told that final exams were less than a week away"