W: (n) antagonism [Related to: antagonistic] (the relation between opposing principles or forces or factors) "the inherent antagonism of capitalism and socialism"
S: (adj) antagonistic, antipathetic, antipathetical (characterized by antagonism or antipathy) "slaves antagonistic to their masters"; "antipathetic factions within the party"
W: (adj) synergistic [Opposed to: antagonistic] (used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more))