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.
sheer shear shier shoer cheer cheero cheery sherry shri cheerio share shirr shire shrew shore cherry sharia shariah char
sheer cheer her shier cheery veer shear cheero weer hear where doughier seer peer beery eery veery deer here hero hoer jeer queer queuer leer leery peery beer heir shoer
sheesh she shea sheugh shew shoe sheuch