read, dear, dare.
baud, daub
You can get the word pyramids from those letters.
it'ev
The 4 letter words with the letters q u and d in it include:quadquid
The word is echo
word
Duty has four letters and starts with a D, and ends with a Y.
One word that fits your criteria is "distant." It starts with the letter 'd,' ends with 't,' and contains seven letters.
The answer to the riddle is "FAN." "Moving air" refers to a device used to create a current of air, and "4 letters" means that the answer is a four-letter word. If you take the letters "d," "i," "l," and "d" and rearrange them, you can form the word "DI[D]L." However, this is a red herring, and the actual answer is "FAN."
There isn't one. You can make the 5 letter word bound
d and e are the silents letters
Yardworks :D