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.
porker porkier parker perkier pricker prickier precure procure progger priggery
barker parker marker burker shirker mirker porker darker chirker jerker corker forker murker sharker lurker worker larker crookery mirkier rookier brickier crooker reeker jerkier freakier perkier tricker breaker forkier croakier quirkier trickier cracker broker brakier tracker rocker shrieker corkier reekier raker phreaker barracker rookery porkier barkier croaker wreaker rockier murkier pricker prickier rockery racker sarkier creakier trekker trucker wrecker dorkier larkier trickery crockery shriekier
pork porky park parka perk perky