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.
gos goas goes goys goos goose goosy cos kos gas goosey gaes guys gays koss cows kois coos koas coys cosy coss gauss guess guise gazoo gassy gussy gawsy cosey cosie cooees cooeys gawsie gussie kousso