Individual words are not protected by copyright. Writing that person X is being chased by “droids” would be copyright infringement only if it seemed that those droids were specific Star Wars characters (BB-8, C-3PO, R2-D2, etc.)
Not sure of the specifics but there was a court case or at least a legal battle over Hello Games calling No Man's Sky as such because Sky... Sky also forcd MS SkyDrive to be renamed OneDrive (which annoyed me cause it was cloud storage and where are clouds? in the Sky).
Taylor Swift also went after people for short combos of words like "this sick beat" IIRC.
In short big corps can be scumbags.
This all said, not sure if there is prior art on the word Droid before Starwars and they have even marketed entire series (Droids cartoon/comic) with the name). I've not heard it used outside of Starwars probably for the good reason that most DO associate it with Starwars so don't want to, but also because, as a shortening of Android, it isn't correct anyhow since the Starwars vernacular seems to refer to any self autonomous robot as a Droid, including the actual Androids such as C-3PO.
I have heard of makers on youtube, e,.g. James Bruton use the phrase Droid but I think that's normally only been in the context of building their own versions of Droids from Starwars or, at worst, something closely resembling or inspired by robots from Starwars. Everything else is referred to as robots.
In conclusion, don't really think MA or partners should use the term in Entropia. Even if legally it's dubious it just sounds weird outside of Starwars,
Wistrel
was there many years before that, in fact, since they first arrived on Calypso.
not 
