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.
sanity snit saint sandy santo snooty snouty sennit snotty seniti sienite snot sand sent scent snide senti snoot snout saned sente suint sained senate sennet sonata sonnet saunaed sinuate
vanity lenity unity sanity nit janty kainite painty vaunty minty finito punty finite bounty linty gahnite reunite lenite kainit canty seniti sienite dainty dunnite tenuity unite chantey shantey manitu annuity gunite pointy ninety mannite manito binit jaunty nitty pinite panty banty knit county runty bonito nite bonita sennit snit dunite tenty unit aunty chanty shanty
sain sane sauna sawn sawney asana sasin