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.
rugosa rugose rugous rugs raucous regs rocs rigs rags ragas rooks rucks raggs rocks rakus recuse rogues roques ruckus raggees raggies reggaes rookies rax
rugosa gos chegoes dagoes segos goas goes goos goys bigos egos gogos jigsaw logos mucosa mucosae rugose rugous sagos zygose dagos chigoes
rug ruga rugae ergo erugo frug drug druggie druggy trug