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.
shuddery shudder chudder shedder shoddier shader chuddar shutter shadier shouter cheddary cheder chider cheddar shatter shooter sheeter chowder chattery shittier shoetree chadar chador chadri
doddery shuddery gadder sadder kidder nodder odder deary deray ruddier redder udder gaudery fodder wedder bidder cheddary bedder shedder badder shudder derry adder muddier dodder ladder faddier padder mudder budder rudery rudder wadder madder tedder widder giddier chudder judder shoddier codder powdery ridder dry