Synonyms for Spare:

adj.

additional (adjective)
supplementary.
all (adjective)
free, trim.
exiguous (adjective)
tiny.
simple (adjective)
chaste, bald, childlike, plain, clear, unadulterated, austere, crystalline, terse, pure, direct, innocent, unsophisticated, candid, artless, elementary, refined, uncomplicated, bare, simple.
supererogatory (adjective)
supererogatory.

n.

going, public, vacant, on offer, seasonal, accessible, available, open, usable. favor, overrun, overkill, supplement, overflow, overcapacity, complement, addition. as well, discharge, besides, too, further, together with something, also, in addition, dispense, let off, excuse, absolve, supplementary, exempt. fit in, squeeze in, put aside, find (the) time, have, have time on your hands, find, conserve. protect, shelter, stand up for, keep (a) watch, shield, defend, guard, safeguard, watch over. sinewy, wiry, willowy, dainty. lend, advance, loan. not harm/touch a hair on someone's head, turn the other cheek, not lay a finger on someone, mean no harm. artifact (noun)
spare part.
thin (noun)
lanky, slender.
undecorated (noun)
plainly, unadorned, simply, functional.

v.

forgive; have mercy upon (verb)
discharge, let off, excuse, exempt, dispense, absolve.
social (verb)
save.

Other synonyms:

accessible, open, public, overkill, usable, overcapacity, willowy, sinewy, going, squeeze in, vacant, available, put aside. absolve, lanky. fit in, supplement, lend, complement. excuse, discharge, find. dispense. have. slim
slender.
undecorated
plainly, unadorned, simply, functional.

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