substantialness vs unreal

substantialness is a noun but unreal is not a noun.

Word	Noun	Adjective	Verb	Adverb
substantialness	Yes	No	No	No
unreal	No	Yes	No	No

substantialness (noun)	unreal (noun)
the quality of being substantial or having substance

substantialness (adjective)	unreal (adjective)
	lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria
	not actually such; being or seeming fanciful or imaginary
	lacking material form or substance; unreal
	contrived by art rather than nature