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.
char chary chair chare charr charro charry share chirr choir cheer chore shear churr chiru chiro cherry sharia churro cheero chorea cheery chirre cheerio shariah shri sheer shier shire shirr shoer shore shrew tiara