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.
cooler coaler coiler collier coalier clear color colliery colour caller colure collar gaoler culler couloir collyria clary clour gluer calory galere gluier killer calorie gallery queller galleria
cooler choler wooler pooler gaoler tooler poler realer iller fullery hiller miller luller woollier killer haulier holier pallier eelier jailer taler moiler coiler dueller mewler collier bolar bolero puller mauler slier volery belier celery toiler coalier holler sealery bluer lier railer muller tiler baller lear hellery raillery dolor bowler hailer toller rulier oiler tailer dallier whaler wilier siller cholera tallier sheller shoaler yeller knoller wailer biller helleri plier teller volar blear bawler filer jowlier howler paler roller veiler mailer relier clear loller chillier galere haleru nailer heeler leer coaler dialer rallier culler fueller tolar reeler lowlier caller healer fleer foolery peeler boiler flier gluer faller palier dealer tailleur fueler ceiler lehr vealier fuller viler sillier heller bullier valuer gallery bailer color feeler oilier fouler fowler sealer sallier ruler hauler roilier jollier solar baler sailer vealer seller taller huller feller puler haler hillier queller dueler millier polar miler woolier poller molar giller waler wheeler dialler filler willer kneeler chiller mealier tiller shalier duller shellier shoalier yowler
cool coolly cooly coolie col collie cowl coulee coly colly coil cole cola coaly coala coal coyly