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.
soirees sirees sirrees sires sores sarees sirs soras sours sorus soars cires seers seres sirras zaires series sieurs source seeress sauries sorrows sirrahs serries souaris sierras surreys sers sris ceres suers saros suras sears saris cereus serais cirrus surras serosa serows surahs serous zeroes cirrose cirrous serious serosae
sirees hirees soirees ires rees chirres trees grees drees creese zaires hires sirrees vires vireos prees mires quires fires sires cires brees bourrees larees moires purees sarees frees fairies dairies heiress tires wires shires res
soiree sire sore siree sirree sir