afield vs abroad

afield is not an adjective while abroad is an adjective.

Word	Noun	Adjective	Verb	Adverb
afield	No	No	No	Yes
abroad	No	Yes	No	Yes

As adverbs, afield and abroad are synonyms defined as:

afield (adjective)	abroad (adjective)
	in a foreign country

afield (adverb)	abroad (adverb)
off the subject; beyond the point at issue	to or in a foreign country
in or into a field (especially a field of battle)	in a place across an ocean
far away from home or one's usual surroundings	far away from home or one's usual surroundings