riches vs treasure

riches and treasure both are nouns.

Word	Noun	Adjective	Verb	Adverb
riches	Yes	No	No	No
treasure	Yes	No	Yes	No

As nouns, treasure is a hyponym of riches; that is, treasure is a word with a more specific, narrower meaning than riches:

Other hyponyms of riches include gold, hoarded wealth.

riches (noun)	treasure (noun)
an abundance of material possessions and resources	art highly prized for its beauty or perfection
	a collection of precious things
	accumulated wealth in the form of money or jewels etc.
	any possession that is highly valued by its owner

riches (verb)	treasure (verb)
	be fond of; be attached to
	hold dear