strength - noun

the property of being physically or mentally strong

capability in terms of personnel and materiel that affect the capacity to fight a war

physical energy or intensity

an asset of special worth or utility

the power to induce the taking of a course of action or the embracing of a point of view by means of argument or entreaty

the amount of energy transmitted (as by acoustic or electromagnetic radiation)

capacity to produce strong physiological or chemical effects

the condition of financial success

permanence by virtue of the power to resist stress or force

strength - thesaurus

durability   effectiveness   enduringness   force   forcefulness   forte   intensity   lastingness   metier   persuasiveness   posture   potency   speciality   specialty