synthetic vs polysynthetic

synthetic is a noun but polysynthetic is not a noun.

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

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

synthetic (adjective)	polysynthetic (adjective)
of a proposition whose truth value is determined by observation or facts	forming derivative or compound words by putting together constituents each of which expresses a single definite meaning
systematic combining of root and modifying elements into single words
involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis
not of natural origin; prepared or made artificially
not genuine or natural
artificial as if portrayed in a film