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.
sennits sennets snits sienites scents sonnets senates sends sanitise cents sanities snots centas snoots scends snouts centos saints santos suints cenotes sonatas zenaidas sanitize sonnetize scientize sands sneds snoods sondes sounds synods sundaes sundews
sennits nits bennets bannets nites quinnats linnets manitus pinites binits sennets bonitas reunites sienites sonnets dunnites unites rennets knits punnets lenites finites jennets gahnites gannets gunites kainites kainits bonnets manitos mannites bonitos snits dunites tinnitus units
sennit seniti sennet senti sienite