Synonyms and related words :
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