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.
gait gat gaiety goat gadi gate gaddi gateau goatee kat qat kit cat got gad gut gout cate kite coat caid guid goad gaed qadi quit qaid cadi gaud kata kadi guide quite gutta quate coati quiet gouty gutty catty kitty gaudy quoit