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.
recross recurs regress regrows wreckers recourse rockrose recarries rakers ruggers riggers reekers rackers raygrass requires rigorous wreakers rigors rigours rockers
cross across recross crass cress crosse crows gross kaross lacrosse macros micros necrose picaros sucrose