Synonyms of backbone

1 Syllable

guts, strength, will, grit, har, spunk, myel, thew, heart, pluck, hu

2 Syllables

moxie, guider, valor, valors, guiders, firmness, nerve, mettle, spirit, nerving, firm-ness, hogback, toughness, hardness, kidney, chine, gingers, plucking, chutzpah, ridge, nerved, ginger, mainstay, rivel

3 Syllables

spunkiness, supporters, moraine, courage, upholders, valiance, patience, resolve, gutsiness, hardiness, upholder, essence, robustness, willpower, hardnesses, sustainer, peppiness, valiantness, gameness, maintainers, steadfastness, maintainer, potence, willfulness, espouser, brawniness, stalwartness, steadiness, sturdiness, stamina, hardihood, solidness

4 Syllables

stabilities, stability, truculence, vivaciousness, pugnaciousness, sedulity, pugnacity, stoutheartedness, lion-heartedness, valorousness, intrepidness, powerfulness, fortitude, tenacity, lionheartedness, apologist, resolution, endurance, confidence

5 Syllables

durability, perseverance, determination, durabilities, longanimity, forebearance, intrepidity, purposefulness, resoluteness, determinations, nonresistance

6 Syllables

stick-to-itiveness, immovability, invincibility

7 Syllables

indomitability

8 Syllables

indefatigability