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.
sledder slider solder solider soldier soldiery sleetier salter slater saltier saluter siltier slatier slitter slotter slittier sluttier solidary sultry saltire
sledder gelder shielder welder plodder pleader melder gladder coleader cloddier ladder leader elder bleeder bladdery bladder lieder lewder fielder wielder yielder