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.
flusher flasher flesher flashier fleshier foolisher filcher fletcher
lusher plusher blusher flusher plashier slushier plasher sloshier clasher polisher plushier flasher foolisher flashier blucher lasher slasher fleshier sloucher flesher welsher
flush flash flashy flesh fleshy fluish