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.
neighed nighed nightie night knifed knight nevoid nighty naevoid neophyte naffed naught navaid nought naivete naughty navette
neighed nighed sighed weighed bighead jughead coughed laughed roughed soughed sughed toughed