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.
canna canny can goanna cannie conn kana cane cain canoe guanay con gan koan gain gaun kain cone guan gaen coin gane kaon coon cony coni kane kina kuna
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