Reactant and Synergist

Reactant noun - A chemical substance that is present at the start of a chemical reaction.

Synergist and reactant are semantically related in catalyst topic. In some cases you can use "Synergist" instead a noun "Reactant", when it comes to topics like something which incites activity.

Synergist noun - A drug that augments the activity of another drug.

Reactant and synergist are semantically related in catalyst topic. You can use "Reactant" instead a noun "Synergist", if it concerns topics such as something which incites activity.