THESAURUS
body, concreteness, decisiveness, density, durability, endurance, energy, firmness, force, fortitude, guts, gutsiness, hardiness, hardness, heartiness, intestinal fortitude, lustihood, lustiness, mass, materiality, might, mightiness, obstinacy, palpability, ponderability, potency, power, powerfulness, robustness, ruggedness, solidity, soundness, stability, stalwartness, stamina, staunchness, staying power, steadiness, sticking power, stoutness, strength, strength of will, substance, substantiality, substantialness, tangibility, temper, toughness, vigor, vigorousness, vitality