An excellent conversation, and one I am happy to see happening, for two reasons. Our trade is inextricably tied to preservation, and that being the case it would be nice if when we invoked one of these words its use was coming from a common sense of things. Discussions like this one, can only help.

The words on the list are open to conjecture, and for most people they are often used interchangeably, To those who have a deep interest in preservation however, then, as the article Don cites suggests each word has a distinctive meaning, though this meaning might shift somewhat depending where on the spectrum, one comes from...

Maybe this is all just so obvious and might could've remained unsaid, all the same and again, I'm happy to see the discussion happening.