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.
assail assoil asshole aisle asyla azalea
sail wassail resail assail reassail sal sall busily casual soil sill causal vassal jezail seal gassily loessal masala mussily vasal nasal fusile noisily pausal saul reseal rosily scissile sisal dossal tahsil tussal missal phaseal cosily byssal missile lousily fossil nosily mousily loessial fissile queasily easily visual basal messily bossily fussily sale basil fusil assoil silo resale resile sassily sessile deasil dossil tissual usual cheesily