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.
labret labored laborite laboured libretti libretto labroid liberty librate lowbred leeboard liberate
labret brut taboret beret bort brat bred brit barret abort buret cabaret gabbart lowbred rebred sabred tabaret tabouret
labra labara labor labour libra librae libri blabber flabbier clabber slabber slabbery