spare - noun

an extra component of a machine or other apparatus

an extra car wheel and tire for a four-wheel vehicle

a score in tenpins; knocking down all ten after rolling two balls

spare - verb

• refrain from harming
• save or relieve from an experience or action
• give up what is not strictly needed
• use frugally or carefully

spare - adjective

• thin and fit
• more than is needed, desired, or required
• not taken up by scheduled activities
• kept in reserve especially for emergency use
• lacking in amplitude or quantity
• lacking embellishment or ornamentation

spare - thesaurus

bare   excess   extra   free   plain   redundant   save   scanty   supererogatory   superfluous   supernumerary   surplus   trim   unembellished   unornamented