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.
sora sour sore sori sura soar sera surah surra sorry serai sirra sorrow sirrah zoaria soiree sierra souari sir ser sri sire sere suer sari seer sear sure zori ceria saree saury serow serry sieur siree
bora fora hora kora mora ora sora tora or