British

Canadian

American

U

umbrella, brolly

umbrella

umbrella, bumbershoot (Midwest)

underlay

carpet pad

carpet pad

underground, tube (train)

subway, metro  

subway

undertaker

undertaker, mortician

mortician

underwear, shorts, boxers, briefs, undershorts, undercrackers, underkeck, undies,  Y-fronts, smalls (male) 

underwear, shorts, undershorts, boxers, briefs, gitch, gotchies, Stanfields, ginch, gonch, gotch, undies

underwear, shorts, briefs, tighty-whities, undies, underoos, Jockeys, Fruit of the Looms, boxers, BVD's

undies, smalls, pants, knickers (female)

panties, underwear, undies, gitch, gotchies, underthings, ginch, gonch, gotch

panties, underthings, underwear, undies

unemployment benefit, the dole (not income support)

employment insurance, pogey, EI, UI

unemployment compensation (not welfare)

unit trust

mutual fund

mutual fund

university, uni, college

university, college, school

university, college, school