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.
tips tipsy tipis dips tups tops taps tapis types topis topes typps tapas topos tapes tepas dipso typos taupes tepees topees tepoys teepees tawpies teapoys toupees diapause dups daps deeps dopas dopes dupes topaz
hips sips ships chips whips tips dips zips rips gips pips nips mips lips quips kips yips