Hammer, MikeHammer, Mike 
a private detective in books by the US writer Mickey Spillane. He is very tough and usually shoots criminals instead of having them arrested.
a private detective in books by the US writer Mickey Spillane. He is very tough and usually shoots criminals instead of having them arrested.- Freedom of Information Act
- Freedom Tower
- free enterprise
- free fall
- free-falling
- free-floating
- Freefone
- underwent
- underwhelm
- underworld
- underwrite
- underwriter
- Underwriters' Laboratories
- undeserved
- undesirable
- undetected
- undeterred
- undeveloped
- undid
- undies
- undifferentiated
- undignified
- undiluted
- undiminished
- undischarged