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.
snit seniti sennit sanity snot sent sienite saint scent suint snoot senti snout snide sente santo sonnet sennet sonata snouty snotty snooty senate sinuate cent send sand sned sonde cento sound centu snood scend saned sandy synod
knit nit binit kainit sennit snit unit