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.
samara sambar zamarra samurai simar smear sambur seamer smeary seamier summary zamarro semiraw cymar seemer simmer somber sombre summer summery
mara samara mar zamarra wommera umbra tamari tamarao dammar smear nummary camera mimbar mammary lumbar sambar chimaera chimera remora embar mura tamarau daymare woomera womera femora timarau cymar mora mair chimar maar damar mare summary maria simar shmear
samba sambo same seam seamy sima soma