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.
gat gait goat gate goatee gut gad qat gateau cat got gaiety kat coat gout goad gaed gadi kata cate gaud coati gaddi gaudy gouty gutta gutty catty quate cattie coatee guttae