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.
natty gnatty nutty nitty netty knotty gnat neat nett nut not net nit knot nada newt nite nota note nowt knit
fatty chatty batty tatty ratty patty natty gnatty catty att satay potty rutty matt battu paty nitty laity putty matey bitty batt gutty jetty witty kitty chitty beauty watt peaty knotty ditty latte jutty petty netty butty matte cutty tutty nutty jotty meaty datto titty dotty bawty shitty