valuer vs appraiser

valuer and appraiser both are nouns.

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

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

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

Other hypernyms of valuer include valuator.

valuer (noun)	appraiser (noun)
someone who assesses the monetary worth of possessions	one who estimates officially the worth or value or quality of things
	one who determines authenticity (as of works of art) or who guarantees validity