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.
glower callower clawer clayware
lower blower shallower willower slower callower hollower bellower plower glower mellower follower flower hallower sallower wallower yellower lowery billowier blowier flawier flowery clawer playwear willowier