Mike, this is how I am using these, I hope it's consistent:
Legacy week owner - Owner of a deeded fixed or floating week as of June 20, 2010, and therefore eligible to enroll in the points program
Legacy points - Legacy week owner who has enrolled in the points program and makes the affirmative decision to redeem their week for points, receiving legacy points
Weeks owner - Someone who owns a deeded fixed or floating week. Note that this may or may not also be a legacy weeks owner, depending on if they've decided to enroll their week in the program (they're not required to)
Weeks points - Same as legacy points, if they've enrolled their week. If not enrolled, weeks do not have a points value
Explorer Collection One of the programs Marriott is offering as a way to use the points that is external to simply booking reservations within the Marriott timeshare system
Exchanger - Not sure of the reference, but I am referring to someone simply seeking to exchange their week, either in the traditional manner using Interval International, or using their points to exchange a week
Premier Exchanger -I would suspect this is just referring to someone who has a certain number of points (6,500 - 12,999) that has Premier Status. Above 13,000 the category becomes Premier Plus.
Plus-points - the incentive points that Marriott has given us that are single use, and non-transferrable, as a signing bonus for joining the program
Trust Points Owner -- what we are calling someone who has purchased points directly from Marriott -- this is different from the Legacy Points Owner, who's points were obtained from redeeming their deeded week for points
I know there are several more...but this is just a quick list
Thanks,
Mike