synergism vs synergistic

synergism is a noun but synergistic is not a noun.

Word	Noun	Adjective	Verb	Adverb
synergism	Yes	No	No	No
synergistic	No	Yes	No	No

synergism (noun)	synergistic (noun)
the theological doctrine that salvation results from the interaction of human will and divine grace
the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects

synergism (adjective)	synergistic (adjective)
	used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more)
	of or relating to the theological doctrine of synergism
	working together; used especially of groups, as subsidiaries of a corporation, cooperating for an enhanced effect