synergistic vs synergism

synergistic is not a noun while synergism is a noun.

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

synergistic (noun)	synergism (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

synergistic (adjective)	synergism (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