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.
sealant slant slanty salient slainte salinity selenite silent soland selenate selenide
alant sealant talent slant pliant callant reliant plant planet plaint gallant coolant gelant aland volante leant volant valiant flaunt eluant gellant slanty walnut