What is another word for "reflex"?

Roget's Thesaurus (1911) lists these synonyms for "reflex": action, and, back, boomerang, bounce, bound, coefficient, collision, contrecoup, direction, echo, elastic, elasticity, equal, every, fly, for, force, kick, opposite, react, reaction, reactionary, reactionist, rebound, rebuff, recalcitrant, recalcitrate, recalcitration, recoil, reflection, reflexion, refluent, reflux, repercuss, repercussion, repercussive, repulse, resonance, restitution.