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.
niobous nibs nobs knobs nabs nebs nubs nabes nabis nubias newbies
niobous bouse dubious poboys bousy booboos boubous phoebus hoboes hobos gibbous goboes gobos kobos lobos oboes rubious yobbos bos bus