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.
fleshes flashes fleches flushes fleeches fletches filches flitches
fleshes fleeches slushes slashes polishes plashes goloshes galoshes clashes caleches calashes flushes fleches lashes flashes blushes lushes leeches leches leashes goulashes plushes relishes sloshes welshes
flesh fleshy flash flashy fleche flush