A purist is one who desires that a particular item remain true to its essence and free from adulterating or diluting influences. The term may be used in almost any field, and can be applied either to the self or to others. Use of the term may be either pejorative or complimentary, depending on context.
Now before you break down "true to it's essence".....remember that compound bows have their own "essence".
We're arguing semantics. I'm talking about someone who professes their love for hunting with a bow....and takes pride in that fact (without making derogatory remarks towards other types of pursuits). I'd call him a bowhunting "purist". You don't have to agree with the label. I'm fine with that.