cast away vs put away

cast away and put away both are verbs.

Word	Noun	Adjective	Verb	Adverb
cast away	No	No	Yes	No
put away	No	No	Yes	No

As verbs, cast away and put away are synonyms defined as:

cast away (verb)	put away (verb)
throw or cast away	turn away from and put aside, perhaps temporarily
	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