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.
simar smear samara sambar simmer smeary summary cymar sambur sombre seamer somber summer seemer seamier semiraw summery zamarra zamarro
chimar simar mar mare chimer tamari aimer timer dimer dammar summary maar sambar mair mara lumbar embar daymare maimer mimbar mimer nummary rimer cymar samara smear damar mammary shmear