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.
numbs neums neumes nimbus nims noms pneumas names neems nemas nomas nomes nomos gnomes nimious
numbs dumbs limbos lumas kombus koumys gumbos mumms mambas mumus gambes gaums combs neums coombs hums jumbos pumas rums jambs sambos combes sums geums doumas iambus dumas jambes humus bimbos umbos chimbs iambs nimbus limbus bums lambs coombes loumas limbs lums koumis kumys gums mums mambos neumes gambs gombos limbas ambos pneumas gambas rumbas bombes sambas bombs sumos combos zombis fumes doums heaumes dumbos tombs wombs chums