sparepieces
nounUK /ˌspeə ˈpiːsɪz/
US /ˌsper ˈpiːsɪz/
Extra parts you keep in case something breaks and you need a new one.
Dad keeps sparepieces for the toy robot in a small box.
OTHER MEANINGS
2. Small leftover bits of something that were not used.
She saved the sparepieces of fabric to make a tiny pillow.
3. Extra game pieces kept in case some get lost.
The board game box has sparepieces in case a token rolls away.
4. Unused moments of free time.
He used the sparepieces of his day to read a comic.