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.
sics sicks sickos skis sacs secs sickees sickies skies sikas socas sakis sucks sikes sacks socks scows saigas scouse six skas suks segs suqs sequoias sags sakes scuzz skees sooks segos skuas sagas sagos soaks sokes skews souks seeks sykes
laics mics pics sics tics chics