Synonyms for Panic:

n.

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

v.

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

Other synonyms:

cold feet. absurdity, horror, terrorize, shake up. depression, hoot, riot. chill, gas. stampede. hustle, joke. scramble. dash. rush. frighten
scarify.
Other relevant words:
absurdity, chicken out, chill, cold feet, confusion, crash, crush, dash, depression, frenzy, funk, gas, hoot, horror, howl, jam, joke, laugh, riot, rush, scarify, scream, stampede, terrorize, trepidation, scare the daylights out of, take fright.

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