monument vs monumental

monument is a noun but monumental is not a noun.

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

monument (noun)	monumental (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

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