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.
sierra sirra sirrah sera sieur surra serry serai sir sirree ser seer sere suer sora sear sura sire ceria cirri serow siree sorry surah soiree sorrow surrey zooier sri
sierra terra err era orra perry sera serry hurray jerry surra gerah merry sirra derry terai kerria terrae wherry cherry jarrah feria ceria kerry vera durra deray sirrah herry murra perea eyra berry array ferry gherao serai hurrah terry wirra sherry