Things people shout that begin with the letter b:
People shout avalanche, amen, all aboard, action and all rise (court). They begin with the letter a.
A four letter word meaning to shout would be yell.As in "he let out a mighty yell".
shout
The anagram for shout is south.
Shout, about, grout.
Do you mean the letter "U"? "You", provided in your question, is a word, not a letter. And by things, do you mean actual nouns, or just words that begin with the letter?
catcall
peal
kick it is shouted at a soccer game
gamut, shout, grout, trout, flout
Apple
shape, sheet, shift, shout, shuck, Shrek