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.
tininess tinniness tawniness downiness tannins doneness tenons
boniness sunniness funniness tinniness phoniness tawniness raininess looniness bonniness shininess zaniness mooniness runniness downiness puniness tininess canniness whininess newness canoness oneness nines saneness fineness linens nowness loneness coniines guanines venines conines doneness canines goneness quinines pennines