shut away vs shut up

shut away is not an adjective while shut up is an adjective.

Word	Noun	Adjective	Verb	Adverb
shut away	No	No	Yes	No
shut up	No	Yes	Yes	No

As verbs, shut away and shut up are synonyms defined as:

shut away and shut up: place in a place where something cannot be removed or someone cannot escape

Other synonyms of shut away include lock, lock away, lock in, lock up, put away.

shut away (adjective)	shut up (adjective)
	closely confined

shut away (verb)	shut up (verb)
place in a place where something cannot be removed or someone cannot escape	cause to be quiet or not talk
	refuse to talk or stop talking; fall silent
	place in a place where something cannot be removed or someone cannot escape