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.
slieve sleeve sleave slave salve solve saliva slavey sylva salvo silva selva salify salvia silvae sleigh sylvae
lieve believe slieve relieve releve delve sleave helve glaive rilievi relive relievo levee belive live leave rilievo sleeve alive olive deleave cleave shelve
sale slew sloe slue sole solei soli syli isle