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.
yucas yucks yugas yags yaks yuks yacks yeuks yocks yogas yakuza yoicks yoks
yucas casa gucks cacaos jucos cacas fucus fucks hucks cycas sucks pucks socas ducks pacas tucks mucus chucks micas shucks lucks yucks cocas bucks quays squaws cocoas quags caws cays caucus quasi quass quais skuas decays case rucks teguas picas chicas ocas showcase mucks aquas macaws yugas