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.
retenes retines retunes redenies retinues reediness redness retains retinas ratines rattens reddens rottenness ratanies ratteens rudeness routines rootiness readiness ruttiness reattains redons rutins ratans redans rhytons rattans ratoons rattons rattoons rowdiness ruddiness radons radians
ketenes butenes retenes tens latens meetness tunes battens liteness tines butanes fattens cetanes catenas steins soutanes mootness lateens ketones codeines tynes quietens redenies retines pattens chutnees stones witness whitens neatness wheatens wetness tautens routines attunes mutines cuteness patines nudeness ratteens potence poteens poutines phytanes hotness rudeness quietness fitness tenues lattens rattens stanes potteens neatens luteins patness patens denes jitneys stenos kittens sateens lateness retunes mittens atones tense tones teens ratines denies dienes muteness fatness neotenies tautness dueness whatness whiteness heightens wideness witneys duotones chutneys
retene redeny retina retinae retine retinue retune preteen