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.
santo saint sanity sent snot sand snit sente snout senti snoot synod sandy suint snood saned cento scent sennit sonata seniti snotty snooty sained senate sennet snouty sonnet saunaed sienite sinuate cent send sned
panto canto tanto santo ant taint quant gentoo banty aunt anti ante anta janty conto finito peanut pant gaunt bonito faint onto panty pinto rant cento annatto taunt unto chant chaunt shanti manta giant haunt lento into boniato cant qanat hant riant canty jaunt quaint punto anatto vaunt manat bento quanta saint manito meant paint junto daunt haint leant tenuto want chanty chianti shanty
sain sane sauna sawn sawney asana