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.
guerilla guerrilla gorilla grill grille krill grail gruel gorily curial corolla criollo cruelly queerly curl graal cruel curly goral growl gooral grayly greyly growly
barilla guerrilla gorilla zorilla perilla hydrilla guerilla rill frill shrill krill terrella rille drill corolla brillo zorillo frilly variola grill grille prill brill trill zorille shrilly