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.
manitus manitous manitos mantuas mannites manteaus mantes mantis mantas manats mantissa mints manatees maundies mounts maunds montes maenads menudos mehndis minutes minuets mentees maenades monetise monodies minds hymnodies mends menads monads mondes mondos mounds monades
manitus tinnitus nits kainits unites dunites kainites dunnites snits sennits pinites mannites manitos contuse manitous lenites gahnites gunites sienites nidus finites knits bonitos bonitas binits nites conatus mantuas reunites cantus units
manito manitou manitu manat manatee mannite manta manteau mantua meant amanita