monumental vs monument

monumental is not a noun while monument is a noun.

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

monumental (noun)	monument (noun)
	a structure erected to commemorate persons or events
	a burial vault (usually for some famous person)
	an important site that is marked and preserved as public property

monumental (adjective)	monument (adjective)
relating or belonging to or serving as a monument
imposing in size or bulk or solidity
of outstanding significance