dreamer

Short definition from Wiktionary

Noun

1. 1
   One who dreams.
2. 2
   Someone whose beliefs are far from realistic.
3. 3
   Any anglerfish of the family Oneirodidae.
4. 4
   A swallow-winged puffbird (Chelidoptera tenebrosa)
5. 5
   An undocumented immigrant who is qualified for relief under the DREAM Act.
6. 6
   Alternative letter-case form of DREAMer.