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.
merches marches marchesa marchese marchesi marshes marishes mariachis
birches merches curches porches marches perches churches searches parches larches arches lurches torches carroches breaches rouches creches crouches girshes rotches marshes riches qurshes brioches brachs earaches broaches marchese roaches grutches braches barouches marchesa gurshes tracheas aurochs troches diarchies parchesi rechews carritches parritches brooches crutches cratches crotches grouches retches orchis ruches preaches britches caroches reechoes huaraches reaches oraches caroaches ratches wretches soroches breeches currachs trochees marchesi