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.
visual visually vasal vassal vessel fissile phaseal
visual usual casual tissual sal phaseal basal masala byssal nasal vasal reassail sisal resale vassal soul sall loessal sail sulu seal causal loessial missal pausal resail reseal dossal saul assail tussal sale wassail