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.
source sours sores souaris surreys sauries soirees soras seres suras soars suers sorus sires surras serous sieurs series sarees sirees surahs seeress serious serosae serries sirrees sorrows
source fierce trice tierce terce farcie price orrice mures grace curse cures course coerce furze force race rice farce burse brace bourse aures lures nurse pierce purse dures terrace trace truce
sour souari surrey surra sure surah sura suer sorry saury sorrow sori sore sora soiree soar usury