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.
whackos wackos whacks wacks wackes wakes wauks wicks wags wogs woks weeks wekas whigs
wackos whackos shackos sickos shacks cacaos tacos shackoes backs packs wracks makos buckos hacks geckoes shakos geckos jacks jockos whacks racks buckoes wacks wackes tacks sacks macks knacks lacks quacks guacos cuckoos shakoes yacks cos kos
whack whacko whacky wack wacke wacko wacky