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.
gentile gentil gentle gently genital genteel genitalia genitally genteelly jauntily jointly
quantile gentile centile quintile pantile lentil until gentle daintily ventail pontil hantle pintail entail mantle gentil entoil inutile jauntily pintle kantele cantle dentil fantail wintle
gent genet genette gentoo agent