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.
addend addenda adenoid attend audient attendee adnate attent
headend addend tendu tend teind duende dent kittened addenda maddened leadened neatened pudenda reddened rodent soddened deodand whitened ladened battened attend latened heightened hoidened hoydened cadent coattend quietened fattened loudened mittened pattened rattened rident saddened deadened tautened widened