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.
courtly curtly curtal curtail cordially cartel curdle greatly crudely cordial cordelle grittily quartile cradle credal kirtle creedal
curtly courtly artily brutely heartily hurtle curtal partly peartly pertly portly dirtily tartily tartly turtle shortly
court curt croute curate curet curette curite scoured