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.
crawlier crawler curlier growlier curler cruller growler crueler caroler coruler caroller crueller griller grueler kruller grillery grueller corollary quarreler quarreller
brawlier crawlier drawlier growlier growler trawler surlier burlier crawler pearlier girlier knurlier frillier marlier relier brawler roilier rallier gnarlier nearlier prowler drawler rulier curlier droolier earlier whirlier
crawl crawly coral craal scrawl scrawly