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.
colossus closes colessees coulisses classis glosses classes glossas glossies calloses coleuses coalesces callouses clozes colzas glasshouse calesas clauses glasses calluses cullises glassies gallowses galleasses galliasses calces glozes
colossus losses flosses glossas glosses
colossi cols calos close cloys coals coils colas coles colessee cools cowls kolos