My first question here, let me know if I am missing some details.
Basically, I need to find the right word to represent a specific entity.
How can I call someone who reacts to something? Not necessarily in an impulsive way. Just reacting to something.
At first, I thought something about "reagent" but I discovered it's a technical (chemistry) word.
Best Answer
You could use the word responder, derived from the verb to respond:
source: Merriam-Webster