lay aside vs stash

lay aside is not a noun while stash is a noun.

Word	Noun	Adjective	Verb	Adverb
lay aside	No	No	Yes	No
stash	Yes	No	Yes	No

As verbs, stash is a hyponym of lay aside; that is, stash is a word with a more specific, narrower meaning than lay aside:

Other hyponyms of lay aside include cache, hive up, hoard, lay away, squirrel away.

lay aside (noun)	stash (noun)
	a secret store of valuables or money

lay aside (verb)	stash (verb)
accumulate money for future use	save up as for future use