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.
sheitans shaitans chitins chitons chitinous shadiness showdowns shoddiness
titans seitans sheitans shaitans witans tans reattains retains chitins stains rattans whitens detains pitons tetanus stanes soutanes ratans medians phytanes butanes attains tansy cetanes tains radians cotans chitons nitons gitanos