massive vs monumental

massive and monumental both are adjectives.

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

As adjectives, massive and monumental are synonyms defined as:

Other synonyms of massive include monolithic.

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