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The suffixes -er and -or mean "someone who..." For instance, runner means "someone who runs." When you add -er or -or to a verb it becomes a noun. Study these examples:
VERB SUFFIX NOUN MEANING bake + er baker someone who bakes dance + er dancer someone who dances run + er runner someone who runs sail + or sailor someone who sails act + or actor someone who acts surf + er surf someone who surfs
The baker gave Jill a fresh muffin.
VERB SUFFIX NOUN MEANING toast er toaster something that toasts grind er grinder something that grinds mix er mixer something that mixes erase er eraser something that erases
Jill pulled the burnt toast out of the toaster.