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.
ghostly ghastly vastly fustily feistily festally vestally festal vestal fistula
ghostly costly hostly mostly hostel chestily lastly testily gustily dustily costal rustily justly nastily mistily vastly fustily ghastly moistly jostle mustily hastily postal feistily zestily beastly tastily sootily chastely lustily yeastily