A noun that begins with U and ends with D is unitard, upland, or the undead.
ditz
delighted!
None do so.
Daewoo.
dell
No country begins with d and ends with e.
An antelope that begins with w and ends in d
details
Bastard
abjectadjectiveadjournadjustdejecteddisjointeddoorjambdrudgejadejudgejaundice
The five letter word that is the opposite of behind and begins with an 'a' and ends with a 'd' is AHEAD.
Okapi.