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.
ptui petti putti puttie pattie pet pit pud pot pat put paty poet pate pied paid pity pout padi pita putt peat pieta putto piety patty peaty petto pouty podia potto potty pitta petty putty