sparer
adjective
Definitions
Scant; not abundant or plentiful.
Example: a spare diet
Sparing; frugal; parsimonious; not spending much money.
Being more than what is necessary, or what must be used or reserved; not wanted, or not used; superfluous.
Example: I have no spare time.
Held in reserve, to be used in an emergency.
Example: a spare anchor; a spare bed or room
noun
Definitions
One who or that which spares.