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.
regrow regrew raker recur rigor racker reeker rigger rigour rugger recarry reekier require wreaker wrecker
grow regrow crow grew aggro regrew checkrow
reg reggae grego reargue rerack rerig dreg dreggy