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.
nitre niterie nitro niter nature nitery nittier knitter noter nadir neuter nutter notary netter natter nutria neater knotter nattier needier nettier nuttier gnattier knottier
goitre mitre litre titre nitre store liter sautoire quatre true retore retire nitro suture stare strew niter suiter tyre kiter attire tire tore tree trey whiter metre stere citer baiter nature dire sitar loiter miter writer retiree outre mature guitar biter satire suitor feature tare goiter gaiter couture future titer waiter shoetree
nit knit nite nitty snit unit unite unity