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.
hypers peres peers perse piers pears peris peruse peeress perries peeries pars pros purs pares pyres pores prese proso prows pairs paris priss praos pries puris praus proas purrs presa paras parrs pross prees pursy press purse pours parse pyros pareus paries parous purees pierce pooris porous pursue pareos parries
hypers ers veers liers lears haeres keirs cooers gears pars heres feres nears viers queuers verso verse leers weirs hers purs shoers ceros sheers cheers peris piers ruers tiers wooers seers peers sers zeros deers tears suers hears quaeres heirs eros eras ears bears biers hoers fears wears heros jeers goers kiers beers lehrs meres errs queers sieurs wheres doers dears xerus seres pears sears terse pros rears perse peres cheeros shears ceres shiers years