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.
sanities sanitise sanitize snits sienites saints santos senates sennits sinuates sneds sands snots scientize sonnetize snouts snoots sondes scents suints cenotes sennets sonatas sonnets sundaes sundews sends scends snoods sounds synods
annuities tenuities sanities vanities lenities unities canities nineties gunites unites coonties dunnites aunties nites dainties pinites bounties punties kainites banties chanties sanitize unties intis unitize lenites finites sienites mannites sanitise quintes counties dunites pointes bonitoes panties reunites gahnites shanties
sanity snit saint santo seniti