imitation vs unreal

imitation is a noun but unreal is not a noun.

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

imitation (noun)	unreal (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

imitation (adjective)	unreal (adjective)
not genuine or real; being an imitation of the genuine article	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