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.
titanous titans tetanus titanias titaness detinues tetanise tetanies dittanies tautens detains tautness tetanize tidiness detainees dottiness tattiness dedans doughtiness
titanous danios tenuous idoneous gitanos coetaneous cutaneous mutinous neotenous stannous tetanus chitinous