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.
adonis atonias atonies atones attains attunes audience
adonis botanise towns setons odeons phaetons tennies tenuis betons tons batons tawnies hoedowns cottons tenias denies toons ketones voudons atonias jettons tennis chitons titanias dittanies rhytons muttons tonus newtons tetanies mutinies redenies lowdowns tones putons buttons ratanies phytons rattons godowns petunias pitons codons guidons litanies townies atones tauons cutinise jetons danios donas boutons botanies donsy taenias photons hypotonias stones tunnies voudouns betonies atonies mutons rattoons vodouns ratoons futons radons dons moutons redons tetanise downs nitons toonies neotenies cytons duotones udons showdowns