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.
sendal sandal sundial synodal cental soundly santol centile saintly snidely snootily snottily
vandal poundal sendal sandal dindle kindle sundial fontal handle cental roundly rondel nidal conoidal wandle gonadial quintal quantal conidial cantal candle indol hondle dandle synodal hypnoidal bundle dental nonideal soundly anodal fondly gonidial kindly quinoidal gonadal nodal unideal rental monadal fondle roundel rundle mandala bindle mental windle
send sennet sundae snide sned sienite senti sente sent sennit seniti sand senate seined scent scend sandy sonde sundew