What is the meaning of Rater?

One who provides a rating or assessment.

One who rates or scolds.

rat-catching

a member of the vesper bat subfamily Myotinae; a mouse-eared bat

to miss (an event or a thing)

to screw up; to mess up

to fail to fire; to misfire

to fail

to yield (a return)

indefinite plural of rate

Source: wiktionary.org