valuer vs valuator

valuer and valuator both are nouns.

Word	Noun	Adjective	Verb	Adverb
valuer	Yes	No	No	No
valuator	Yes	No	No	No

As nouns, valuator is a hypernym of valuer; that is, valuator is a word with a broader meaning than valuer:

valuer: someone who assesses the monetary worth of possessions
valuator: one who estimates officially the worth or value or quality of things

Other hypernyms of valuer include appraiser.

valuer (noun)	valuator (noun)
someone who assesses the monetary worth of possessions	one who estimates officially the worth or value or quality of things