randomness vs random

randomness is a noun but random is not a noun.

Word	Noun	Adjective	Verb	Adverb
randomness	Yes	No	No	No
random	No	Yes	No	No

randomness (noun)	random (noun)
the quality of lacking any predictable order or plan
(thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work

randomness (adjective)	random (adjective)
	lacking any definite plan or order or purpose; governed by or depending on chance