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.
grimly grimily grumbly gremial crumbly grumble creamily graymail cormel caramel crumble
grimly primly trimly grimily trembly termly drumly dreamily primely grumbly primal roomily crumbly creamily firmly brambly rumbly warmly
grim grime grimy crime gorm gram grama gramma gramme gremmie gremmy grum grume