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.
darks darkeys darkies dirks dorks dreks taroks drakes darics drecks drouks derricks drugs turks drags treks dregs troaks trucks trokes trocks tricks trikes tracks tarocs durocs traiks drogues teargas tricksy turkeys turkois druggies
barks sharks arks charks harks narks warks sarks larks parks carks quarks darks marks narcs corks burkes tracks arracks mirks berakes porks drakes rakus birks freaks merks croaks dreks creaks marcs dorks reracks parkas murks markas traiks charkas berks chirks forks shirks breaks burkas lurks borks caracks kirks wracks phreaks rakes quirks brakes dirks irks cracks zerks jerks carracks crakes araks wreaks rakis barracks taroks arcs hayracks perks treks works racks troaks turks groks yerks
dark darkey darkie darky daric dirk dork dorky drake drek