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.
titanias titans titanous tetanies titaness tetanise dittanies tetanus tetanize detains tautens tidiness detinues tautness detainees dottiness tattiness teutonize dedans doughtiness
titanias danios taenias tenias atonias botanies botanise litanies hypotonias petunias ratanies dittanies tetanies tetanise