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.
preamble premeal proemial primal primly primely permalloy
ramble bramble preamble rambla rumble brambly crumble grumble drumble tremble
pram paramo praam preemie premie proem