abbreviated vs brief

abbreviated is not a noun while brief is a noun.

Word	Noun	Adjective	Verb	Adverb
abbreviated	No	Yes	No	No
brief	Yes	Yes	Yes	No

As adjectives, abbreviated and brief are synonyms defined as:

abbreviated (noun)	brief (noun)
	a condensed written summary or abstract
	a document stating the facts and points of law of a client's case

abbreviated (adjective)	brief (adjective)
(of clothing) very short	concise and succinct
cut short in duration	(of clothing) very short
	of short duration or distance

abbreviated (verb)	brief (verb)
	give essential information to someone