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.
sikas skas skuas sikes sicks saigas sickos sacs sukkahs sics zaikais skis sickees sags sickies suks sequoias soaks sykes sacks sooks sucks sagas socas skews skies souks socks sakes sakis sagos skees seeks sokes squaws sax six soukous secs segs suqs
sikas pikas kas chicks sheikhs ukase wicks tikes tikkas dikes takas skuas zaikais nicks sikes kaes picks hookas quokkas yikes shiksa kikes guaiacs haikus kakas hookahs hoicks hikes likes paiks okas pikes ricks saigas sicks hicks gigas mikes okays kaiaks pikis kaas micks kicks jackass vigas quicks bikes koas loggias kays picas wricks sequoias haiks tikis shikse sheiks chukkas chicas wekas tokays ticks licks taigas dicks sukkahs skas micas keas yoicks
sika ska sick sickee sickie sicko sike skua