Synonyms for Panic:

n.

chill. crush, frighten/scare the wits out of someone, jam, confusion, shake up, rush, frenzy. attempted, lame, desperate, face saving, depression, maiden, crash, limp, hostile, amateur, lamely, commemorative. quail, have a horror of (doing) something, lose your nerve, become afraid, chicken out, be/live in dread of, live in fear (of), quake, take fright. gas, laugh, riot, howl, absurdity, joke, laughter, hoot, scream. scarify, scare the daylights out of, terrorize. consternation (noun)
shock.
cowardice (noun)
phobia, terror, tremulousness, yellowness, cowardice, fearfulness.
fear (noun)
funk, fearfulness.
panic (noun)
confusion, rush, horror, depression, frenzy, stampede, trepidation, crash, crush, terror, alarm, jam, cold feet, dismay, scare.

v.

alarm (verb)
chill, surprise, frighten, startle, dismay, shock, signal, alert.
frighten (verb)
disturb, scare, petrify, haunt, intimidate, threaten, set on edge, frighten, harrow, unnerve, agitate, rattle, alarm, horrify, terrify.
panic (verb)
terrify, chicken out, unnerve, startle.

Other synonyms:

cold feet. terrorize, absurdity, shake up, horror. depression, riot, hoot. gas, chill. stampede. joke, hustle. scramble. dash. rush. frighten
scarify.

Usage examples for panic

  1. Yesterday was- yesterday- a little feeling of panic came over him. – Half Portions by Edna Ferber
  2. The top of the tree remained above ground some distance; and to prevent unnecessary panic the police immediately caused the place to be concealed by a high and close board fence. – Recollections of Europe by J. Fenimore Cooper
  3. In sudden panic he realized he was helpless. – The Colors of Space by Marion Zimmer Bradley