dreamer

noun4

1. •
   One who dreams.
2. •
   Someone whose beliefs are far from realistic.

   • You may say I'm a dreamer/ But I'm not the only one/ I hope someday you'll join us/ And the world will live as one. — 1971
3. •
   Any anglerfish of the family Oneirodidae.
4. •
   A swallow-winged puffbird (Chelidoptera tenebrosa)