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.
daddy duddy dad didy dead dada dado duad deedy toady toddy teddy dowdy doody today duddie dud did tad duty deed tidy dato died dodo dawt data dude doat date dido doty toad daut dita tody
baddy caddy paddy daddy waddy faddy add ready duddy toddy didy soddy biddy neddy gaudy lady toady midday middy gaddi shady teddy widdy fuddy wady readd giddy kiddy beady heady buddy muddy cuddy leady eddy bawdy ruddy noddy shoddy
daddy add dad dada waddie paddy duddie duad dead dado gaddi laddie caddy caddie faddy baddy baddie duddy waddy