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.
sundae sundew saunaed sound snide sonde sunned senate sinuate sned sand send saned sandy sente suint snood synod scend sained seined sennet signed sinned sonata sonnet zonate sienite zenaida
sundae nada vanda antae banda anode neonate pennate panada ruinate lanate lunate connate senate sonde cnida sundew indue denude vendue duende honda tannate node undee nude nide binate saunaed phonate endue enate fondue monde panda noonday pinnate quinate landau cnidae snide bendee innate benday indie zonate vendee donate hennaed dynode phenate unde hyphenate undue
sun sauna sunn sunna sunnah sunny