synthetic vs unreal

synthetic is a noun but unreal is not a noun.

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

synthetic (noun)	unreal (noun)
a compound made artificially by chemical reactions

synthetic (adjective)	unreal (adjective)
of a proposition whose truth value is determined by observation or facts	lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria
systematic combining of root and modifying elements into single words	not actually such; being or seeming fanciful or imaginary
involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis	lacking material form or substance; unreal
not of natural origin; prepared or made artificially	contrived by art rather than nature
not genuine or natural
artificial as if portrayed in a film