foeman vs adversary

foeman and adversary both are nouns.

Word	Noun	Adjective	Verb	Adverb
foeman	Yes	No	No	No
adversary	Yes	No	No	No

As nouns, adversary is a hypernym of foeman; that is, adversary is a word with a broader meaning than foeman:

foeman: an armed adversary (especially a member of an opposing military force)
adversary: someone who offers opposition

Other hypernyms of foeman include antagonist, opponent, opposer, resister.

foeman (noun)	adversary (noun)
an armed adversary (especially a member of an opposing military force)	someone who offers opposition