put away vs discard

put away is not a noun while discard is a noun.

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

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

put away (noun)	discard (noun)
	getting rid of something that is regarded as useless or undesirable
	(cards) the act of throwing out a useless card or of failing to follow suit
	anything that is cast aside or discarded

put away (verb)	discard (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