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.
botanic botanica boatneck beatnik boating booting bating biting boding baiting batting beading beating betting bitting butting
botanic satanic tetanic titanic tannic tonic tunic atonic botanica photonic phytonic ketonic neotenic hypotonic stannic diatonic
botany botonee botonnee butane