foe vs enemy

foe and enemy both are nouns.

Word	Noun	Adjective	Verb	Adverb
foe	Yes	No	No	No
enemy	Yes	No	No	No

As nouns, foe and enemy are synonyms defined as:

As nouns, foe and enemy are synonyms defined as:

foe and enemy: an armed adversary (especially a member of an opposing military force)

Other synonyms of foe include foeman, opposition.

foe (noun)	enemy (noun)
a personal enemy	an opposing military force
an armed adversary (especially a member of an opposing military force)	any hostile group of people
	an armed adversary (especially a member of an opposing military force)
	a personal enemy