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.
whirler whirlier
birler whirler whirlier trailer friller triller driller pearlier nearlier gnarlier quarreler curlier coruler caroler girlier hurler earlier furler surlier burlier railer burler broiler brailler ruler roilier curler griller marlier knurlier pearler frailer shriller
whirl whirly whorl wirily swirl swirly twirl twirly