put to sleep vs put away

put to sleep and put away both are verbs.

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

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

put to sleep (verb)	put away (verb)
kill gently, as with an injection	turn away from and put aside, perhaps temporarily
help someone go to bed	eat up; usually refers to a considerable quantity of food
	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