"Global" is a six-letter word that fits that description. It's meaning is closest to "worldwide."
common, general, familiar, main, influential, predominant, popular, regular, steady, usual, worldwide, widespread, universal
world, worldwide, planetary,
global, universal, international, worldwide
rife
rife
globalcommon
Global
havoc , wreck
The letter you is not a letter but a word . Yet the letter U is the first letter in the word universal and also in the word undercarriage.
widespread
catholic
No, the word widespread is an adjective, a word that describes a noun, for example a widespread belief or a widespread contamination.There is no noun form for the adjective widespread.