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.
frowsy frows frowzy furrows farrows vrows froes faros frouzy vrouws furioso ferrous furious furs firs ferreous frees fears fours fares furzy fairs fries farcy fires frise fiars fores frays froze feres frass frizzy pharos furies fraise frisee vireos feuars ferias forays faeries fairies ferries foresaw foresee phoresy various gheraoes pharaohs
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
frow fro faro forwhy froe vrow