repose vs lay to rest

repose is a noun but lay to rest is not a noun.

Word	Noun	Adjective	Verb	Adverb
repose	Yes	No	Yes	No
lay to rest	No	No	Yes	No

As verbs, lay to rest is a hyponym of repose; that is, lay to rest is a word with a more specific, narrower meaning than repose:

Other hyponyms of repose include rail, lay, blow, bury, entomb, inhume, inter, rebury.

repose (noun)	lay to rest (noun)
freedom from activity (work or strain or responsibility)
a disposition free from stress or emotion
the absence of mental stress or anxiety

repose (verb)	lay to rest (verb)
put or confide something in a person or thing	place in a grave or tomb
lie when dead
put in a horizontal position
lean in a comfortable resting position
to put something (eg trust) in something
be inherent or innate in