realist

Short definition from Wiktionary

Noun

1. 1
   An advocate of realism; one who believes that matter, objects etc. have real existence beyond our perception of them.
2. 2
   An adherent of the realism movement; an artist who seeks to portray real everyday life accurately.
3. 3
   One who believes in seeing things the way they really are, as opposed to how they would like them to be.

Adjective

1. 1
   Eye dialect spelling of realest.