Fear is related to the modern German gefahr, meaning danger. Afraid is of Anglo-French origin, from afrayer, meaning frightened. Contro l is of Latin origin, from cribrum, a sieve. A sieve sifts materials, controlling their exit. Dying is of Old English or old German origin meaning to die.
Terror is of Latin origin, from terrere, meaning filled with fear.
Anxiety is used as one of 5 words to express uncertainty. Anxiety is next used as being synonymous with inner anxiety, then as being synonymous with inner and outer anxiety. And, not just in accent, and inflection. Language is different in different ages. The language spoken in Beowulf's England would be strange to Chaucer.