Aphabetic letter pairs in words

UA - uvula

UB : Unsub

UC: unerotic

UD = unattached

UE - use

UF = uncuff

UG - using

UH = unlatch

UI - uni (sea urchin)

UJ - Uj, a northern Syria village

UK = uplink

UL = upheaval

UM - “Um,” the expression of uncertainty, or Ulm, a German town

[…or ultimatum]

UN = union

UO = undo

UP - unwrap

UQ = Uruq

a village in Yemen

UR = uglier

US = uxorious

UT - uppercut