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.
snottier snootier snoutier sinter santir snider santera saunter santero sandier santeria sonneteer sender sander center sentry sonder santur sunder santoor santour senator sounder sanitary sanatoria sanitaria sanitoria centra centre cinder sundry zander
gnattier nattier knottier nuttier nettier nittier snottier pointier daintier netter paintier snootier nutter knitter lintier mintier rentier knotter runtier natter snoutier jauntier tentier
snotty snot snoot snooty snout snouty