ersatz vs unreal

ersatz is a noun but unreal is not a noun.

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

ersatz (noun)	unreal (noun)
an artificial or inferior substitute or imitation

ersatz (adjective)	unreal (adjective)
artificial and inferior	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