fiend

In obsolete terms the difference between addict and fiend

is that addict is to adapt; to make suitable; to fit while fiend is an enemy, unfriend, or foe.

As nouns the difference between addict and fiend

is that addict is a person who is addicted, especially to a harmful drug while fiend is an enemy, unfriend, or foe.

As a verb addict

is to cause someone to become addicted, especially to a harmful drug.

In obsolete|lang=en terms the difference between fiend and fendliche

is that fiend is (obsolete) an enemy, unfriend, or foe while fendliche is (obsolete) like a fiend.

As a noun fiend

is (obsolete) an enemy, unfriend, or foe.

As an adjective fendliche is

(obsolete) like a fiend.

As nouns the difference between fiend and hellspawn

is that fiend is (obsolete) an enemy, unfriend, or foe while hellspawn is (fantasy) a creature or creatures from hell.