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.
sennets sennits sonnets scents senates sends cents snots sienites snits sneds sonnetize snoots suints saints snouts centos santos scends centas cenotes sonatas sands scientize snoods sondes sounds synods sundaes sundews
bannets rennets jennets bennets punnets sonnets gannets sennets bonnets linnets nets genets quinnats lunets minuets nonets neats netts sennits newts tenets
sennet seined sennit sente sinned sonnet sunned