terror

As an adjective intense

is strained; tightly drawn.

As a noun terror is

terror.

Terror is a related term of concern.

As nouns the difference between terror and concern

is that terror is terror while concern is that which affects one's welfare or happiness.

As a verb concern is

(label) to relate or belong to; to have reference to or connection with; to affect the interest of; to be of importance to.

In uncountable terms the difference between terror and disquietude

is that terror is  The action or quality of causing dread; terribleness, especially such qualities in narrative fiction while disquietude is a state of disquiet, uneasiness, or anxiety.

In countable terms the difference between terror and disquietude

is that terror is  Something or someone that causes such fear while disquietude is a fear or an instance of uneasiness.

Distress is a related term of terror.

As nouns the difference between distress and terror

is that distress is (cause of) discomfort while terror is terror.

As a verb distress

is to cause strain or anxiety to someone.

Terror is a related term of detestation.

As nouns the difference between terror and detestation

is that terror is terror while detestation is hate coupled with disgust; abhorrence.

Terror is a related term of shock.

As nouns the difference between terror and shock

is that terror is terror while shock is sudden, heavy impact or shock can be an arrangement of sheaves for drying, a stook.

As a verb shock is

to cause to be emotionally shocked or shock can be to collect, or make up, into a shock or shocks; to stook.

Terror is a related term of disgust.

As nouns the difference between terror and disgust

is that terror is terror while disgust is an intense dislike or loathing someone feels for something bad or nasty.

As a verb disgust is

to cause an intense dislike for something.

Terror is a related term of worry.

As nouns the difference between terror and worry

is that terror is terror while worry is a strong feeling of anxiety.

As a verb worry is

to seize or shake by the throat, especially of a dog or wolf.

Perturbation is a related term of terror.

As nouns the difference between perturbation and terror

is that perturbation is (uncountable) agitation; the state of being perturbed while terror is terror.

Terror is a related term of antipathy.

As nouns the difference between terror and antipathy

is that terror is terror while antipathy is contrariety or opposition in feeling; settled aversion or dislike; repugnance; distaste.