These are all words for the bad feeling you have when you are afraid.以上各词均表示害怕时的恐慌情绪。
fearthe bad feeling that you have when you are in danger, when sth bad might happen, or when a particular thing frightens you指害怕、惧怕、担忧：◆(a) fear of flying害怕坐飞机◆She showed no fear.她毫无惧色。
terrora feeling of extreme fear指惊恐、恐惧、惊骇：◆Her eyes were wild with terror.她的眼睛里充满了恐惧。
panica sudden feeling of great fear that cannot be controlled and prevents you from thinking clearly指惊恐、恐慌：◆I had a sudden moment of panic.我突然一阵惊慌。
alarmfear or worry that sb feels when sth dangerous or unpleasant might happen指惊恐、惊慌、恐慌：◆The doctor said there was no cause for alarm.医生说不必惊慌。
frighta feeling of fear, usually sudden通常指突如其来的惊吓、恐怖：◆She cried out in fright.她吓得大声叫喊。
fear or fright?用 fear 还是 fright？
Fright is a reaction to sth that has just happened or is happening now. Use fear, but not fright, to talk about things that always frighten you and things that may happen in the future. * fright 指对刚刚发生或正在发生的事情的反应。对一直使人害怕的事物和对未来可能发生的事情感到担忧应该用 fear，而不能用 fright：◆I have a fright of spiders.◆his fright of what might happen
Patterns
a fear/terror of sth
in fear/terror/panic/alarm/fright
fear/terror/panic/alarm that…
to be filled with fear/terror/panic/alarm
a feeling of fear/terror/panic/alarm
[C]aperson, situationorthingthatmakesyouveryafraid可怕的人；恐怖的事；可怕的情况◆Thesestreetgangshavebecometheterroroftheneighbourhood. 这些街头少年团伙使得周围邻里谈之色变。◆Deathholdsnoterrorsfor(= doesnotfrightenorworry)me. 死神是吓不倒我的。◆Theterrorsofthenightwerepast. 夜间那些恐怖的事情都已经成为过去。[U]violentactionorthethreatofviolentactionthatisintendedtocausefear, usuallyforpoliticalpurposes（通常出于政治目的）恐怖行动，恐怖SYNterrorism◆acampaignofterror恐怖运动◆terrortactics恐怖手段➡ see alsoreign of terror[C](informal) aperson (usuallyachild) orananimalthatcausesyoutroubleorisdifficulttocontrol讨厌鬼；小捣蛋◆Theirkidsarereallittleterrors. 他们的小孩都是十足的讨厌鬼。