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.
solidary solitary solider soldiery solder slider solitaire soldier zoolatry salutary sultry slater slatier saltire saltier siltier slitter sledder sleetier slittier sluttier zoolater salter
solidary lidar military solitary
solidi solid slid sold slide sloid soldi soldo soled