It's mostly semantics but a sore point in some circles, especially with that crappy "ereaders mess up your circadians" paper floating around.
Desktop and laptop PCs can be used to read ebooks, too. But few people call them ebooks readers just as few people refer to cellphones as cameras no matter how many pictures they take with them.
Terms like camera, media player, and yes, ebook reader, are best reserved for the single function devices, to avoid confusion. Nobody is going to beat you up for saying a tablet is *your* ebook reader because it is a valid use of a tablet. And a common one, just like taking pictures or listening to music with a phone. But it is somewhat helpful to keep the devices separate in conversation.
If nothing else, for the sake of the children... and newbies.
In this case, if we were talking about a dedicated ebook reader, the only possible answer would be "copy over the original PDF and pray it opens".
