The word impromptu begins with i and ends with u.
No word in the English language begins with U and ends with J.
But U
FLU
Ursula, utopia
Unfix is a 5 letter word. It begins with U and ends with X.
A noun that begins with U and ends with D is unitard, upland, or the undead.
There are none.
A word that starts with A and ends with U: apercu.
umiak, might be spelled umiaq or umiac
There is no country that begins with "y" and ends with "i." There is no country that begins with "y" and ends with "u," either. Currently, the only country in the world that begins with "y" is Yemen. Yugoslavia is now called Serbia & Montenegro.
A word that starts with U and ends with G: understanding.