efficacy

noun 0.860

efficaciousness

noun 0.836

effectivity

noun 0.775

effectuality

noun 0.771

bioefficacy

noun 0.748

effectiveness

noun 0.697

inefficacy

noun 0.670

efficient cause

noun 0.668

efficiency

noun 0.643

effective

noun 0.631

effeteness

noun 0.605

ineffectiveness

noun 0.561

potence

noun 0.553

static efficiency

noun 0.547

potency

noun 0.545

effective energy

noun 0.539

productive efficiency

noun 0.536

ill effect

noun 0.525

infectivity

noun 0.524

operativity

noun 0.523

effect

noun 0.522

desired effect

noun 0.517

executability

noun 0.515

productiveness

noun 0.514

actionability

noun 0.511

inefficiency

noun 0.501