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.
senior senor senora snore scenario seiner senary sunnier senarii scenery saner sneer sonar sinner sneery sooner sunray synura zanier
senior junior nor funnier linier minor vinier canoer lunier veinier rainier punier pawnor panier honor phonier honour senora sunnier denier downier teenier tenour tinnier wanier wennier whinnier sheenier ginnier noir finnier venire whinier tinier tonier tawnier tenor zanier donor senor snore fawnier manor weenier fennier winier runnier punnier pinier pannier loonier moonier goonier cannier nori bonier bonnier shinier
sen scena scene seen seine sene senna sewn sienna xenia seisin seizin