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.
shouter shooter shutter sheeter shatter shudder shoetree shuddery shittier shoddier shader chowder shadier shedder chatter chudder cheater chitter chattery chattier chador cheder chider cheddar chuddar
couter router shouter outer pouter souter touter quoter otter coater louder goutier looter powter cutter potter reutter muter butter rioter footier poutier putter mooter rootier bootery oater zootier dotier tauter toter boater cooter utter hooter tooter hotter cautery uteri knotter cuter shooter hauteur noter rooter hootier mutter gutter loiter voter rotter footer totter jotter neuter nutter lotter outre goiter cotter sootier suiter doter dotter auteur shutter
shout shot shut shoat shoot shote shott shute