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.
scars scaurs scares sowcars soucars scarious scariose sakers scries scarce screes sugars sucres scours scores screws cigars saggers sucrose seggars soakers secures sucrase suckers sackers squares saggars saguaros scurries squarrose skiers skirrs secrecy seekers squires skerries
cars vicars sowcars scars soucars picaras guars acarus acres agars curs gaurs scaurs cigars saguaros saggars eggars recurs muggars scares gars crus squares sugars decares dekares chukars shikaris picaros ecrus lycras lucres fiacres cris cors cougars hegaris makars cares carrs jaguars micros macros carse mucors coarse beggars seggars nacres sucres daycares decors uakaris chukkars shikars
scar scarry scary scare scarey scoriae escar sacra scaur score screwy scree scoria scry scurry sucre screw escrow