unreal vs cardboard

unreal is not a noun while cardboard is a noun.

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

unreal (noun)	cardboard (noun)
	a stiff moderately thick paper

unreal (adjective)	cardboard (adjective)
lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria	without substance
not actually such; being or seeming fanciful or imaginary
lacking material form or substance; unreal
contrived by art rather than nature