shut up vs lock away

shut up is an adjective but lock away is not an adjective.

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

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

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

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

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

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