Synonyms for Spare:

adj.

additional (adjective)
supplementary.
all (adjective)
free, trim.
economical (adjective)
niggardly.
exiguous (adjective)
tiny.
extra, reserve (adjective)
free, supererogatory, superfluous, supernumerary, surplus, unoccupied.
insufficient (adjective)
inadequate.
severe (adjective)
abrupt, acerbic, acrimonious, acute, ascetic, astringent, austere, authoritarian, basic, bleak, blunt, brisk, brusque, caustic, censorious, chilly, cool, correct, crisp, critical, curt, cutting, demanding, disciplined, dour, draconian, dry, exacting, frosty, fundamental, grim, gruff, harsh, hidebound, icy, imperial, inflexible, intense, intolerant, keen, lean, meticulous, obdurate, obstinate, oppressive, piquant, precise, prudish, puritanical, raw, relentless, rigid, rigorous, severe, sharp, short, spartan, stark, stern, stiff-necked, strict, stringent, tart, unbending, uncompromising, strait-laced.
simple (adjective)
artless, bald, bare, candid, chaste, childlike, clear, crystalline, direct, elementary, innocent, plain, pure, refined, simple, terse, unadulterated, uncomplicated, unsophisticated, austere.
small (adjective)
baby, bantam, beggarly, compact, deficient, delicate, diminutive, dwarfish, itty-bitty, little, meager, microscopic, miniature, minimal, minor, minute, miserly, modest, negligible, niggardly, nugatory, paltry, petite, picayune, piddling, pocket, puny, scant, scanty, scrawny, slight, slim, small, smallish, sparing, stingy, teensy, teeny, teeny-weeny, tiny, toy, trifling, ungenerous, wee, weeny, short.
supererogatory (adjective)
supererogatory.
thin; sparse (adjective)
frugal, lanky, lean, meager, modest, scant, scanty, scrawny, slender, slight, slim, sparing, stingy, wiry.

n.

accessible, available, going, open, public, seasonal, usable, vacant, on offer. addition, complement, favor, overflow, overkill, overrun, supplement, overcapacity. absolve, also, as well, besides, discharge, dispense, excuse, exempt, further, in addition, supplementary, too, let off, together with something. conserve, find, fit in, have, put aside, squeeze in, find (the) time, have time on your hands. cellulite, fat, flab, gut, double chin, beer belly, baby fat, beer gut, love handles, middle-aged spread. defend, guard, protect, safeguard, shelter, shield, watch over, stand up for, keep (a) watch. dainty, sinewy, willowy, wiry. advance, lend, loan. mean no harm, not harm/touch a hair on someone's head, not lay a finger on someone, turn the other cheek. artifact (noun)
spare part.
scanty (noun)
frugal, inadequate.
spare (noun)
bare, dispense with, excess, extra, fifth wheel, free, give up, lean, meager, meagerly, meagre, part with, redundant, reserve, save, scanty, spare part, sufficient, supererogatory, superfluous, supernumerary, surplus, thin, trim, unnecessary, unneeded, unoccupied.
thin (noun)
lanky, slender.
undecorated (noun)
functional, plainly, simply, unadorned.

v.

do or manage without (verb)
dispense with, part with, save, short.
forgive; have mercy upon (verb)
absolve, discharge, dispense, excuse, exempt, let off.
social (verb)
save.

Other synonyms:

accessible, available, going, open, overkill, public, sinewy, usable, vacant, willowy, put aside, overcapacity, squeeze in. addition, conserve, dainty, exempt, loan, overflow, overrun, wiry. absolve, lanky. complement, fit in, lend, supplement. discharge, excuse, find. dispense. have. slim
slender.
undecorated
functional, plainly, simply, unadorned.
Other relevant words:
conserve, discharge, excuse, exempt, extra, free, give up, in addition, meagre, open, part with, save, slender, superfluous, supernumerary, surplus, thin, unoccupied.

Usage examples for spare

  1. I shall sleep in the spare room next you to- night." – Jewel A Chapter In Her Life by Clara Louise Burnham
  2. " I can't spare you now, Hetty," he answered. – Hetty's Strange History by Anonymous
  3. I can spare only a few minutes. – Malcolm Sage, Detective by Herbert George Jenkins