Looker /(?)/

Look·er

Looker

n.
  1. One who looks.
  2. A person who is physically very attractive, especially a beautiful woman.
    Did not this fatal war affront thy coast, Yet sattest thou an idle looker-on ?

Phrases & Compounds
Looker-on
a spectator; an onlooker; one that looks on, but has no agency or part in an affair.