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.
march marsh merch mariachi marish marshy moorish
arch march larch parch search curch lurch roach caroch mariachi merch brach orache huarache perch birch cratch torch church harsh diarchy preach marsh rich earache preachy broach reach orach porch ratch currach caroach carroch huaracho breach torchy churchy
mar maar mair mara mare maria marrow marrowy marry