massiveness vs massive

massiveness is a noun but massive is not a noun.

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

massiveness (noun)	massive (noun)
an unwieldy largeness
the property of being large in mass

massiveness (adjective)	massive (adjective)
	consisting of great mass; containing a great quantity of matter
	imposing in size or bulk or solidity
	being the same substance throughout
	imposing in scale or scope or degree or power