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.
scares scars screws screes sucres scores scaurs scarce scries soucars squares secures sowcars scurries scariose scarious cigars sakers scours sugars soakers seggars suckers secrecy sucrose sackers sucrase saggers squires saggars cicorees saguaros skerries squarrose skiers skirrs seekers
cares daycares scares dekares squares decares eggars gores kyries rockeries crews piggeries hegaris recarries aggress beggaries acres agrees vagaries cookeries cress lucres ligures greys saggars saguaros scarce fakeries jaggheries sucres jaguars rogueries gurries picaros knackeries fiacres puggarees shikaris chukkars chicories chickarees waggeries toggeries doggeries quires decrees grues scurries screws scars bakeries scores rookeries gars cries seggars decuries ogres cores jaggaries picaras mockeries curies puggries cowries jaggeries requires agars coarse regress vicars figures cicorees guars curries quarries puggrees nacres equerries cougars beggars caress carries quackeries eagres corries carrs carse queries pugrees pugarees cars hickories egress kauries buggeries skerries auguries gaurs grees makars scaurs acarus cigars screes soucars secures caries kerries sowcars quaeres muggars squires cures sugars ogress scries decries degrees digress tigress uakaris wiggeries chickories chukars shikarees shikars
scar scarry scary scare scarey scoriae escar sacra scaur score screwy scree scoria scry scurry sucre screw escrow