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.
welshes welches
welshes leashes welches slushes slashes polishes plashes gulches lushes belches blushes bolshies filches lashes fleshes flushes calashes clashes culches galoshes goloshes goulashes mulches plushes relishes sloshes zilches flashes