"spares" in the noun sense
1. spare part, spare
an extra component of a machine or other apparatus
2. fifth wheel, spare
an extra car wheel and tire for a four-wheel vehicle
a score in tenpins knocking down all ten after rolling two balls
"spares" in the verb sense
1. spare, save
refrain from harming
save or relieve from an experience or action
"I'll spare you from having to apologize formally"
3. spare, give up, part with, dispense with
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
Source: WordNet® (An amazing lexical database of English)
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