An udder is a mammary organ that secretes milk, characteristic of cows and other mammals.
Utter is an adjective describing something as complete or absolute. Utter is also a verb meaning to speak or to put forged money into circulation.
Examples
“It’s just an utter tragedy to lose a man of that caliber in the water today,” Newport Beach Fire Chief Scott Poster said during a press conference, according to NBC Los Angeles. [WVEC]
State Department of Corrections records indicate Hansen has prior Tulsa County convictions of assault with a deadly weapon, uttering a forged instrument, false impersonation and larceny of a motor vehicle. [Tulsa World]