abroad vs overseas

abroad and overseas both are adjectives.

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

As adjectives, abroad and overseas are synonyms defined as:

As adverbs, abroad and overseas are synonyms defined as:

abroad (adjective)	overseas (adjective)
in a foreign country	in a foreign country
	being or passing over or across the sea

abroad (adverb)	overseas (adverb)
to or in a foreign country	beyond or across the sea
in a place across an ocean	in a place across an ocean
far away from home or one's usual surroundings