I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
bawdier beadier badder baiter bawdry beader battier biter bider bedder boater beater batter bitter bidder budder battery bittier boudoir batterie better bettor butter bootery buttery
bawdier rowdier dowdier faddier shadier headier woodier hoodier weedier giddier tidier lewder gaudier deedier ruddier leadier reedier moodier seedier muddier needier powder powdery readier beadier wader wider chowder shoddier