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.
whishes wishes whooshes washes wiches witches wooshes watches washhouse
fishes cuishes pishes knishes dishes whishes wishes shes mushes lushes moshes mashies sheas coshes fashes deashes miches gashes rushes bashes shoes tushies quaiches dashes noshes ashes rashes reshoes cashes seiches quashes shews whooshes shies choushes cashews wooshes pashes niches liches lashes joshes fiches hushes geishas quiches mashes toeshoes gushes tushes washes gnashes meshes hashes leashes rishis pushes reshes riches rushees sashes bushes toshes boshes wiches shushes
whish wish which wisha swish swishy