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.
crisp crispy grasp
crisp rasp crispy grasp soursop
cris crissa kris curs curiosa curies crus cruise crosse cross cries cressy crass cress corse cors carse cars carious caries cruse curios curious curse scries