from abroad

[Maybo]

The family came here from abroad [=from a foreign country] three years ago. (https://learnersdictionary.com/definition/abroad)

Is "from" the only preposition can be followed by an adverb? Such as "from overseas", "from home".
I'm not sure if "home" in "from home" is a noun or an adverb because when we say "go home", "home" is an adverb.

 

[Maybo]

Does it apply to "overseas"?

 

[probus]

Overseas is usually an adjective or an adverb. But maybe it can be a noun. How about this:

If you are seeking exotic experiences, overseas is probably the best place to look.

 

[GoesStation]

It sure looks like a noun in a sentence like the OP's. Compare these:

He's just returned from Lyon.
He's just returned from overseas.

 

[jutfrank]

When they follow from, abroad and overseas are noun phrases.

 

[YAMATO2201]

Overseas is usually an adjective or an adverb. But maybe it can be a noun. How about this:

If you are seeking exotic experiences, overseas is probably the best place to look.

Most applications came from overseas.
https://www.ldoceonline.com/dictionary/overseas (emphasis mine)

Question: Does from overseas sound informal to you?

overseas
ɴ /ˌəʊvəˈsiːz/
(functioning as singular) ɪɴꜰᴏʀᴍᴀʟ a foreign country or foreign countries collectively
https://www.wordreference.com/definition/overseas (my emphasis added in magenta)

Is "from" the only preposition that can be followed by an adverb?

 

[jutfrank]

Question: Does from overseas sound informal to you?

No, it isn't informal.

 

[GoesStation]

I prefer "abroad" unless the speaker is really thinking only of places that require crossing an ocean to reach. Most speakers aren't so finicky, though, and treat the words as synonyms.