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.
skirred skirret squired scarred suckered scurried skirt scared scored screed scried sacred secured scoured sugared squared saggered skywrote saggared skywrite scrod skort secret squirt cigaret saggard secrete
skirred carried curred curried garred quarried quired recarried recurred required scarred scurried skirret squired shikarred