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.
trigo trig trug trog troak troke trick triac tarok toric terga taroc trike trock traik tricky yttric troika turaco touraco trickie turacou drag dreg drug torc trek turk
trigo rig sorgo farrago trig sargo prig burgoo aerugo ergo erugo forego rerig frig forgo virago cargo grego grig largo pargo brig
tori torii trio atria stria striae