Some Dragon editor once had an editorial on unusual words he learned from D&D, D&D has always being tossing obscure words about, prestidigation, lycanthrope, dweomer and so forth paragon is not out of the ordinary and if it is on a shelf adventure modules some of which are marked 'Heroic' and some 'Paragon' and some more 'Epic' and picking out one or two the punter sees in the blurb that the heroic one is for level 1 to 3 and the paragon one is 14 - 16 and the epic one is 28-30 the punter will figure out that in D&D terms paragon is higher level than heroic and not as high sa epic with out ever finding that paragon can be used as a substitute for exemplar and will still know enough to use it correctly in D&D terms.