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.
pipits pipets pipettes poppets pupates puppets paupiettes
pits pipits spits spaits teapots depots pots spitz sopites puts pitas wapitis spites repots puppets pats pipets pets sippets boughpots septs lappets tappets spots bowpots rapids poppets moppets opts coopts cupids cowpats coapts spats lipids tippets whippets
pipit piped pipet pipette pipped