put away vs cast away

put away and cast away both are verbs.

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

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

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