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.
trog trug trig taroc troak terga trigo tarok troke trock turaco drogue troika turacou touraco drug torc dreg drag trek turk toric traik triac trick trike drouk duroc truck track