Shout is to yell as brag is to

Shout is to yell as brag is to boast or bluster. This is so, because shout and yell mean the same thing, to raise your voice, while brag means to say something, like "I beat you!" in a boasting way. It is more or less a boasting statement. So, the word that would go well with this sentence is boast or bluster, both of which are synonyms for brag.

Shout is to yell as brag is to gloat or boast