Step 1: Focus on the core idea behind synergy, which is unity of action, several parts pulling in the same direction.
Step 2: Cooperation clearly matches this, Shared matches the joint nature of the effort, and Conjunct means joined together, so all three fit.
Step 3: Discord describes clashing or being at odds, the reverse of a synergetic relationship, making it the odd one out.
\[\boxed{\text{Discord}}\]