wingnut

Short definition from Wiktionary

Noun

1. 1
   A deciduous tree of the genus Pterocarya native to Asia.
2. 2
   A person who is or seems odd, eccentric, or crazy; especially, someone with bizarre or extreme political views.
3. 3
   A member of the air force (in a town that hosts a USAF installation).
4. 4
   A person with large ears.
5. 5
   Alternative form of wing nut (“(mechanical) nut with wing-like projections”).