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.
pinnas pinas pins pinnace pinnies pains pians punas peins pions pines pannes pianos pennis pennies pens puns pans pons hyponeas pansy peens panes pones peons pawns peans penis penes poons hyponoias paeans paeons pensee peones ponies panacea pawnees peonies
annas cannas sennas duennas donnas mannas siennas sunnas hennas goannas pinnas pinas snaws bunns kinase punas guineas bennis bunas kanas kinas faunas lunas tineas bennes tenias mynas jinns naos hyaenas whenas unais rennase tonnes vinas scenas ruanas zinnias pannes nans pennis anas nays anoas manas mynahs wynns sunns gnaws taenias faenas guanays veenas conns jinnis genoas guanase minas quinoas joannes sunnahs nuns tennis lanais monas bonnes saunas inns lianas nanas nonas hyponeas xenias donas banns linns tunas manias unaus chinas hyenas
pinna pinnae pinny pin pein spinny penna spine pennae opine penne punny penny piny pain panne pian pennia piano pion pina epinaoi pine spin piney spinney penni spiny