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.
sun sunn sunny sauna sunna son syn sen sin sunnah snaw snow sinh sine soon sown sewn sign sone sane sene syne sawn sain seen hyson scena snowy sinew scene sonny seine scion senna sawney sienna sinewy