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.
slicks slacks silicas sulks silks sulcus sleeks slakes celiacs salukis selkies sulkies silkies siliques slags slogs slugs siliquose siliquous sawlogs
licks slicks rollicks killicks cowlicks clicks flicks klicks laics flocks calicos likes hillocks blacks flics slacks silicas ilks maiolicas locks kliks lacks beylics mullocks flecks silks rowlocks shlocks blocks shellacks kylikes clocks milks bilks relocks clucks clacks killocks bollocks plucks bullocks lucks colics beyliks celiacs flacks pollacks pollocks placks relics gallicas shylocks
slick salic silica siliqua siliquae silique slack