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.
drowsy drossy drowse dross trows draws duros hydros dressy dowries daresay hydrous drys dors drees deers doors tiros trios troys dorsa duras druse dares trois dures durrs dries trews doers taros tyros dears dorrs drays toros dress hydras tressy torose douras dories duress deairs durras triose torous derris derays dairies dearies derries diaries dourahs durries hydrase
frowsy drowsy trows drossy farrows drowse sorrows prows narrows marrows gorsy horsy vrows vrouws furrows frowzy browse frows serows brows rosy brosy borrows barrows arrows rows harrows crows grows morrows prosy burrows yarrows
dowry draw drew duro trow rowdier dowdier