using keywords in FCPX is a great way to organise and search for clips. However, it is quite easy to add keywords accidentally by mistyping them. It seems these mis-typed keywords stay in FCPX for ever, because they keep showing up when creating a smart collection existing of a selection of keywords. Even if there is not a single clip left with the wrong keyword, it is still selectable when creating an smart collection.
Is there a way to get rid of these obsolete keywords ?
If you create the Smart Collection using Keywords before you remove a keyword, yes, it stays in there. But if you remove the Keyword category from the Smart Collection, close that window, reopen it and add Keyword back, it's gone. A little quirk, but not horrible.