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.
gentil gentile gentle gently genital genteel genitalia genitally genteelly jauntily jointly
gentil dentil lentil pontil until pintle fontal quintile nattily gently jointly cantle quintal auntly entail quaintly mantel snootily pentyl ponytail riantly centile santol snottily dental lintel mental cental nuttily rental faintly fantail quantal cantal gauntly hantle inutile gentile saintly daintily quantile ventail entoil lintol mantle pantile pintail jauntily knottily gentle nautili wintle
gent gentoo genet genette agenda agent