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.
plaint plant planet pliant plained planate planed plenty pollinate planned polenta palinode pollenate pollened
plaint flint slant sealant reliant plant flinty glint coolant linty alant elint eluant flaunt lint valiant leant volant volante gelant gellant callant client gallant glinty planet pliant salient slainte slanty
plain plan plane papillon spline