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.
soldan suldan sultan slidden soliton sultana slowdown saltine xylidin xylidine
suldan soldan holden golden gulden milden olden sultan sialidan
sold soldo soldi solid isolate souled solute soloed solidi solate soled soiled slide slid sled sild isolead