spare
noun
an extra component of a machine or other apparatus
Synonymsspare partan extra car wheel and tire for a four-wheel vehicle
Synonymsfifth wheela score in tenpins; knocking down all ten after rolling two balls
verb
refrain from harming
Synonymssavesave or relieve from an experience or action
“I'll spare you from having to apologize formally”
give up what is not strictly needed
“he asked if they could spare one of their horses to speed his journey”
use frugally or carefully
adjective
thin and fit
“the spare figure of a marathon runner”
“a body kept trim by exercise”
Synonymstrimmore than is needed, desired, or required
“trying to lose excess weight”
“found some extra change lying on the dresser”
not taken up by scheduled activities
“a free hour between classes”
“spare time on my hands”
Synonymsfreekept in reserve especially for emergency use
“a reserve supply of food”
“a spare tire”
lacking in magnitude or quantity
“a bare livelihood”
“a scanty harvest”
lacking embellishment or ornamentation
“a plain hair style”
“unembellished white walls”
Source: WordNet 3.1, Princeton University