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.
goanna canna guanay gan gown gaen kana gaun gane gone goon guan koan conn gain gonia goony canny guano gunny cannie gooney goonie can con gun
canna goanna manna anna ana nona faena penna biennia pennia anoa pinnae zinnia sunna nanny sienna sunnah donna choana shanny fauna lanai henna panne nana liana guanay ruana mania pinna sauna senna fanny canny kana pennae mana duenna choanae hyaena