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.
grammar gramary crammer grimmer grummer creamer crimmer grimier groomer krimmer creamery creamier crummier crumber
grammar rammer crammer gramary
gramma gramme gram grama gremmie gremmy