RATER
a person who, or a thing which, rates something; (in early use especially) a person who fixes the rate for a tax, wage, etc.
a racing yacht with a rating (frequently specified by preceding numeral) which determines whether it is subject to a handicap when racing other yachts.
a racing yacht with a rating (frequently specified by preceding numeral) which determines whether it is subject to a handicap when racing other yachts.