plaque vs monument

plaque and monument both are nouns.

Word	Noun	Adjective	Verb	Adverb
plaque	Yes	No	No	No
monument	Yes	No	No	No

As nouns, monument is a hypernym of plaque; that is, monument is a word with a broader meaning than plaque:

Other hypernyms of plaque include memorial.

plaque (noun)	monument (noun)
a memorial made of brass	a structure erected to commemorate persons or events
(pathology) a small abnormal patch on or inside the body	a burial vault (usually for some famous person)
	an important site that is marked and preserved as public property