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.
serai sera sri ser sierra sari seer sori sura sora sear suer sere serow ceria serry sirra sieur surra surah sirrah souari sir cere cero sire soar sore sour sure zero zori
serai terai era rai gerah uraei deair gherao vera sera peri perea peerie moirai korai feria eerie aerie raia sierra ceria deray faerie terra eyra cheerio