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.
gipsy gips gypsy gyps
gipsy tipsy yipes chips whips tipis kips tips dipso zips sipes ripes biopsy hips gips gypsy dips quips lips quipus mips nipas nips pipes pips popsy rips sips posy wipes ships yips