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.
secret secrete secured scart security sacred scrota scried scared scored screed scarred skirret scoured cigaret saggered suckered scrod skirt skort cigarette squirt skirred squared squired sugared saggared
secret great skirret garret sacred regret regreet nacred egret aigret acred greet caret cart curt curet cruet crit cred cigaret scart secrete teacart
sacra scoria sucre scare scarey scarry scary score scar scree scoriae screw screwy scry scurry secure skerry escrow