Not so simple word game

Try to find the longest combination of letters that make a word by substituting a vowel in one position with any other vowel. For example,

bAg, bEg, bIg, bOg, bUg

But please only add a word that is 4 letters or longer. For example,

last, lest, list, lost, lust

Originally posted by STANG
Try to find the longest combination of letters that make a word by substituting a vowel in one position with any other vowel. For example,

bAg, bEg, bIg, bOg, bUg

But please only add a word that is 4 letters or longer. For example,

last, lest, list, lost, lust

balled, belled, billed, bolled, bulled

(bolled means swollen)