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.
guanin guanine gonion canine guenon gunnen quinin quinina quinine canon conin kinin cannon conine coniine quinone
guanin nine onion minion leonine kinin quinina anion anon benign venin bunion fanion ronion rennin tannin pinion wanion panino fanon nanny canon munnion linin quinine guanine quinin conine conin gonion venine canine inion reunion renin dynein pennine union panini hyenine
guan guanay guano gan gun gaen gain gane gaun goanna guinea gunny iguana