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.
dullness dulness tallness dailiness dailyness delaines dalliance tolanes toluenes towlines talons tolans
fellness foulness chillness fullness tallness coolness fulness wellness dulness dullness illness realness soleness haleness colones lowliness vileness mellowness cleanness silanes sullenness slowness millines alines jowliness beelines wiliness bowlines guylines oiliness shallowness gluiness plainness alienness lunes maleness blueness violones paleness dailiness planes kaolines malines chalones hollowness flanes felines bylines valines salines lioness clines xylenes mealiness towlines clones slyness lenes villainess lanes holiness lowness wholeness callowness wooliness sallowness relines fallowness silliness leanness jawlines lines jolliness tolanes hilliness dailyness woolliness glueyness chilliness cholines hyalines