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.
loom loam louma loamy lum lam limo luma lamb lama limy lima lime lame limb ylem limey limbo limbi lamby lemma limba lamia limby llama
boom loom room zoom doom toom om