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.
solitary solidary solitaire salutary soldiery sultry slitter solider soldier zoolatry slittier salter slater solder slider siltier slatier slotter saltier saltire saluter sleetier sluttier zealotry zoolater
military solitary pellitory salutary solidary
slit slitty solate soldi solid solidi solute