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.
slyness slowness soleness silliness salines silanes sullenness sallowness solons salons solans silence saloons salinas solions silenus solanos xylenes salience salinize selenous selenious
glueyness dailyness slyness wellness wiliness cleanness dulness maleness vileness villainess jolliness hollowness callowness haleness chillness fullness holiness silliness coolness realness leanness foulness sullenness hilliness mellowness woolliness sallowness illness jowliness dailiness plainness lioness gluiness alienness slowness fellness fallowness blueness fulness lowness paleness lowliness mealiness oiliness soleness dullness tallness wholeness wooliness chilliness shallowness