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.
regard regrade recarried record regret regrate regreet recurred required recrate recruit recreate
laggard haggard niggard regard saggard acarid squared grad saggared caird card beggared grid cared bogart keycard guard scared garda sugared
recarry regrew regrow wreaker breaker freakier creakier dreggier