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.
seaport sport sporty support spurt separate sprit spirt sprout spored spirit spoored sporoid speared sprat superette sparid spread sparoid speered speired spiered spiroid supered
aport seaport port apart rapport report sport sporty support deport