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