appraiser vs valuer

appraiser and valuer both are nouns.

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

As nouns, valuer is a hyponym of appraiser; that is, valuer is a word with a more specific, narrower meaning than appraiser:

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

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