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.
gutsy guts gouts cutesy gats cuts gates guids cutis goats gaits gauds quits gudes cutes cuties quotas quiets cuteys guides quotes quoits gaudies gateaus quietus goatees cutesie cutties gaieties gods kats kits qats cats cots cuds gads
nutsy gutsy uts patsy huts butts bitsy cuts guts quits buts lutes mutes mutts butes utes knouts pouts putts routs sautes suets dauts duets tauts touts tutus chutes shutes nuts bouts outs routes ghauts puts potsy juts cutes cutesy phuts cutis gouts footsy louts outsay shouts muts beauts jutes ruts sudsy suits ditsy duits tootsy tuts utas mauts autos shuts
gut gout gouty gutta guttae gutty