antagonist

noun 0.833

protagonist

noun 0.654

agonic

noun 0.641

actant

noun 0.639

antagonism

noun 0.637

aggressor

noun 0.630

agon

noun 0.622

agitator

noun 0.612

actioner

noun 0.611

activator

noun 0.607

ligand

noun 0.606

opponent

noun 0.603

activist

noun 0.591

agent

noun 0.580

actuator

noun 0.577

antigen

noun 0.576

instigator

noun 0.566

opioid

noun 0.562

protagonism

noun 0.561

sympathomimetic

noun 0.559

agonistics

noun 0.559

agentive

noun 0.558

competitor

noun 0.556

agent noun

noun 0.556

prime mover

noun 0.555

combatant

noun 0.555

inducer

noun 0.551

stimulant

noun 0.550

secretagogue

noun 0.545

reactant

noun 0.545

actor

noun 0.544

adrenoceptor

noun 0.544

stimulator

noun 0.544

interactor

noun 0.543

exercitant

noun 0.543

opposer

noun 0.543

adrenergic

noun 0.543

attractant

noun 0.539

ager

noun 0.537

catalyst

noun 0.535

inhibitor

noun 0.535

cholinomimetic

noun 0.534

aggress

noun 0.533

coactivator

noun 0.533

opiate

noun 0.531

excitant

noun 0.531

oxidant

noun 0.530

advocator

noun 0.528

oppositionist

noun 0.528

inotropic

noun 0.528

oxidizing agent

noun 0.527

enactor

noun 0.526

interactant

noun 0.526

allosteric

noun 0.525

exciter

noun 0.524

anticholinergic

noun 0.524

provoker

noun 0.523

acetylcholine receptor

noun 0.523

atropine

noun 0.521

psychoactive

noun 0.520

bronchodilator

noun 0.520

bioactive

noun 0.519

allergen

noun 0.518

anabolic

noun 0.518

proponent

noun 0.517

advocate

noun 0.517

cannabinoid

noun 0.516

chemical agent

noun 0.516

catalytic agent

noun 0.514

adversary

noun 0.514

adaptogen

noun 0.513

initiator

noun 0.512

anticipator

noun 0.511

attacker

noun 0.511

antiasthmatic

noun 0.510

elicitor

noun 0.509

attractor

noun 0.508

receptor

noun 0.507

contender

noun 0.506

athlete

noun 0.505

antioxidant

noun 0.505

oppressor

noun 0.504

oxytocic

noun 0.504

anorexigenic

noun 0.504

oxidizer

noun 0.502

heroine

noun 0.502

antiestrogen

noun 0.502

action group

noun 0.502

abductor

noun 0.502

oxotremorine

noun 0.501

select agent

noun 0.501