put away vs put to sleep

put away and put to sleep both are verbs.

Word	Noun	Adjective	Verb	Adverb
put away	No	No	Yes	No
put to sleep	No	No	Yes	No

As verbs, put away and put to sleep are synonyms defined as:

put away (verb)	put to sleep (verb)
turn away from and put aside, perhaps temporarily	kill gently, as with an injection
eat up; usually refers to a considerable quantity of food	help someone go to bed
kill gently, as with an injection
place in a place where something cannot be removed or someone cannot escape
stop using
throw or cast away
lock up or confine, in or as in a jail