soon vs shortly

soon and shortly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
soon	No	No	No	Yes
shortly	No	No	No	Yes

As adverbs, soon and shortly are synonyms defined as:

Other synonyms of soon include before long, presently.

soon (adverb)	shortly (adverb)
in the near future	in the near future
	for a short time
	in a curt, abrupt and discourteous manner
	at a short distance
	in a concise manner; in a few words