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.
sadden sodden sudden sateen satin sedan seton stain stane stein steno satiny seitan sitten soudan soutane
bidden ridden midden sodden hodden redden shodden sudden sadden madden hidden chidden den dean maiden wooden duodena deaden hoyden louden mueddin hoiden dene laden odeon deni codein fadein redeny coden leaden hoddin dudeen widen loden deny hyoidean
sad sade sadi said soddy sudd tsade tsadi