unreal vs imitation

unreal is not a noun while imitation is a noun.

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

unreal (noun)	imitation (noun)
	copying (or trying to copy) the actions of someone else
	something copied or derived from an original
	the doctrine that representations of nature or human behavior should be accurate imitations
	a representation of a person that is exaggerated for comic effect

unreal (adjective)	imitation (adjective)
lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria	not genuine or real; being an imitation of the genuine article
not actually such; being or seeming fanciful or imaginary
lacking material form or substance; unreal
contrived by art rather than nature