I want to systematically add tags (/custom taxonomy terms) to all previous posts, from a predefined set of tags (i.e., not Yahoo tags or tags from 3rd-party APIs).
For future posts, I would like tags to be either suggested or added based on the content of posts.
Ideally: I would like a more customized way of recommending/adding tags than simply looking for the tag text in an entry; ideally I'd be able to specify a set of related words (such as with a term meta field) so that, for example, a tag of
Educationis added not just when "education" appears in a post but when some of a specified list appear in the post:
teachers, school, standardized tests, math, etc.
Can you recommend a plugin or strategy that would help achieve this?
I'm open to ideas both simple and complex.