Keywords: Implement a Hierarchical System

So some users on here (chiefly keyword warrior) spend a lot of time sorting through keywords to isolate redundancies. Takes a lot of effort.

But another thing that might be useful is isolating what keywords have hierarchical parents. I'll use detective as an example:

anything tagged with "male detective", or "female detective", or "private-detective" should immediately have "detective" applied as a parent. I understand that people probably do this, but I expect there are some that don't - that have been missed. People are generally sloppy taggers. There are probably many other examples from other keywords where a parent-child relationship could be established.

"parenthood" would be parent of "motherhood" or "fatherhood" etc.