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.
leeches leches leaches letches lyches liches laches loaches lichees leashes lychees latches lochs laichs lashes lichis lushes litchis
eches beeches leeches leches hutches coaches caches vichies hootches etches boches hooches maches niches patches ditches echoes muches taches beaches naches rouches batches liches reaches couches meshes vouches sheuchs wiches techies duchess wretches roaches reechoes pouches pechs notches mooches fiches fitchews botches retches poaches bitches lychees gouaches quaiches quitches latches heuchs touches letches aches bouchees hitches leaches ratches lyches vouchees rotches hotches chews duchies mouches hoochies ouches seiches nautches miches pitches hatches chess lichees reshes butches echos wyches matches witches fitches vetches techs laches quiches ketches cutches cooches loaches catches mutches itches fetches watches baches aitches nitchies peaches pooches rechews riches ruches douches teaches yechs
leech lech leach leachy letch fleche fleech