Re: Searching a DB index.. possible?

I am trying to figure out how I can introduce full text search "tips"... tips meaning, like if you start typing Mer .. 

then a box with a couple of words underneath comes up, with Mercedes, Mercury and so on :P

I am thinking that the word suggestions needs to come from the already existing tsearch2 index. 

Words that are frequent in the index could be ranked higher as a search tip.

Is there a way to query the actual existing index?

How else could one approach this? There are many sites that uses this, so perhaps there is an easier way I haven't thought of yet.

Thank you / Moe