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.
manatee manat mentee mannite manteau meant monte manta maned manned manito manitu minute maenad moaned mantua manitou mint menad mined monad minty monde maund mount hymned maundy minuet monied mooned
manatee cuneate donate sinuate ruinate pennate neonate mentee lunate lineate lanate quinate connate binate innate phonate phenate hyphenate enate pinnate senate zonate tannate