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.
crueler crueller coruler cruller grueler grueller curler crawler curlier caroler kruller caroller crawlier quarreler quarreller griller growler grillery growlier corollary
crueler grueler quarreler realer reeler relier ruler rulier burler hurler furler coruler crueller cruller curler grueller kruller quarreller
cruel cruelly creel creole curule gruel