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.
primal primly premeal primely primula proemial permalloy preamble
primal graymail dermal remail airmail bromal brumal formal ramal grimly gremial normal premeal primly proemial ceramal serumal trimly
prim prima prime primi primo perm pram premie prom promo