birth·er 
(bûrthər)
(bûrthər)n.
A person who denies that Barack Obama was born in the United States and asserts that he therefore became president in violation of the requirements of the US Constitution.
- overpressurization
- overprice
- overprint
- overprivileged
- overprize
- overproduce
- overproducer
- overproduction
- overproof
- overproportion
- overproportionate
- overproportionately
- overprotect
- overprotection
- overprotective
- overprotectiveness
- overqualified
- overran
- overrate
- overreach
- overreacher
- overreact
- overreaction
- overreactive
- overrefine