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.
tugs tags togs dugs tegs teggs togas tucks teguas tuques togues toques taigas tux dogs digs tics dags teaks ducks tikes takas tacos degas ticks takes tokes dukes tacks tikis dagos tykes
bugs fugs vugs hugs jugs lugs mugs pugs rugs dugs tugs chugs