memorial vs brass

memorial and brass both are nouns.

Word	Noun	Adjective	Verb	Adverb
memorial	Yes	No	No	No
brass	Yes	No	No	No

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

memorial (noun)	brass (noun)
a structure erected to commemorate persons or events	a wind instrument that consists of a brass tube (usually of variable length) that is blown by means of a cup-shaped or funnel-shaped mouthpiece
a recognition of meritorious service	a memorial made of brass
a written statement of facts submitted in conjunction with a petition to an authority	an ornament or utensil made of brass
	impudent aggressiveness
	the persons (or committees or departments etc.) who make up a body for the purpose of administering something
	the section of a band or orchestra that plays brass instruments
	an alloy of copper and zinc