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.
conga congo congou cooing conk gong cooeeing conic conky cuing going cangue cueing gang king konk
conga tonga donga song bongo booing tanga doing fanega dong panga anga pooing nongay mongo looing senega shooing sanga hong boing pong mooing bong congo tong fanga wrong cooing manga wooing hypoing long lingua linga gong going young
con coign coin cone coney coni conn cony coon icon cogon coigne scone