appreciator

noun3

1. •
   Someone who appreciates a given thing.
2. •
   Someone who values something highly.

   • […] I speak as an appreciator of not just the architecture but the way you have preserved its atmosphere, — 1993
3. •
   Someone who assesses or appraises the value of something.

   • Always, as I wrote, I was both reader and writer, both the conceiver of the action and the appreciator of it. — 1940