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.
sain sin sawn sinh sign sane sine sauna scion seine sinew sinewy sawney sun zin son sen syn sewn sunn zany cion sone sene syne sown soon seen cine snow zein snaw zine hyson scena scene senna snowy sonny sunna sunny
ain fain vain cain gain kain lain main pain rain sain tain wain chain an in