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.
bittier bitter battier biter baiter butter better batter buttery battery batterie bider bettor beater boater bidder bawdier bootery beadier badder beader bedder betray budder boudoir
battier rattier wittier gnattier cattier pottier knottier jettier pettier chattier shittier cottier bittier nettier dottier puttier guttier nattier ruttier fattier nuttier tattier nittier tier goutier rootier fatter batter cutter petter quitter bitter matier lotter mitier rotter mutter hootier matter dotier latter pottery reutter zootier titer mattery tottery shutter shatter littery tater chatter whitter whetter watter knitter cattery toter better pitier lottery ratter buttery phatter haughtier jitter gutter guttery battery chattery netter nutter meatier hatter attire hotter fitter vetter footier doughtier fetter butter patter otter litter ritter metier potter jotter cotter knotter letter tatter getter setter peatier dotter putter hitter jittery natter tetter sootier titter totter utter wetter whitier poutier chitter sitter yatter