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.
sonnet sennet sonde sonata sunned sinned sennit sent snit snot sned scent senti sente sound zoned snout saint snoot saned suint snide snooty snouty snotty senate sanity sained seniti signed seined sundew zonate sundae zooned saunaed sienite sinuate
bennet rennet jennet bannet sonnet bonnet sennet linnet punnet gannet net neat gunned tinned conned fanned canned vanned banned tanned panned wanned lunet sunned pinned genet nett ninety donned chinned quinnat shunned sinned wonned inned sennit binned pineta tunned punned newt minuet cannot dinned tenet manned winned penned denned nonet finned funned kenned dunned shinned ginned yenned
sonny son senna sone soon sown sunn sunna sunnah sunny