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.
goombahs goombays gambas coombs gombos gambias coombes gambs comas combs gamas gumbos commas gammas combes combos gambes gummas kombus gamays cumbias caeomas gums gams gaums camas games comes camass comose comous koumis koumys
goombahs amahs bimahs embays cumbias gambas gambias goombays limbas mambas rumbas sambas mas
goombah goombay coomb coombe gombo