monumental vs massive

monumental and massive both are adjectives.

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

As adjectives, monumental and massive are synonyms defined as:

Other synonyms of monumental include monolithic.

monumental (adjective)	massive (adjective)
relating or belonging to or serving as a monument	consisting of great mass; containing a great quantity of matter
imposing in size or bulk or solidity	imposing in size or bulk or solidity
of outstanding significance	being the same substance throughout
	imposing in scale or scope or degree or power