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.
gawsy gassy gas gawsie gays goas gaes caws gauss gussy gauzy goosy queasy causey goosey kas gos guys koas keas kays kaes kaas goes goys goos gaze cows cosy cays case casa
gawsy bassy shaws waws taws daisy sassy paws easy vaws haws hawse jaws caws gassy queasy laws massy maws miaows gnaws newsy raws saws daws tawse chaws yaws