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.
sirra sierra sirrah surra sir sirree sire sura sera sora sieur siree surah sorry serry cirri serai surrey sorrow soiree sri ser sour seer suer sear sori sore soar sere sari sure cire
sirra wirra tiara chirre array surra mbira firry hurrah hurray jarrah kerria lira birr terra moira murra naira orra cirri sierra sirrah durra terrae whirry moirai whirr chirr shirr yirr