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.
crud crude cruddy cred curd card cord cared credo curdy cored cured cried creed caird cruet crowd cardia croute cardio caried curred corody crowdy crowdie curried corrade corrody carried corrida cardiae corrode cart grid grad curt crit carat guard caret grody gored grade gourd gride garda carte crate court curet grout greed kraut