Then there is the abuse of "-ee" words. Normally, the "-ee" is the object of the action and the "-er" is the subject. For example, a referee has disputes referred to him (or her), and a lessor lets a property to a lessee.
So what is a conference attendee? Presumably, the person to whom the attendant at the event serves drinks?
And a retiree is someone who has
been retired, presumably against his will by an aggressive HR department? If it was his own choice, he'd be a retirer, obviously - or maybe the HR manager is the retirer, because he or she creates all the retirees?