It seems that you still haven't had time to Google the word apologist, Bane. I know, folks here have been keeping you busy, so I hope I can help.
It's not an "apostate JW" word by any means. It's simply an English word that refers to someone who defends an idea or a school of thought or a philosophy or a doctrine.
In fact, I believe it's often, but by no means exclusively, associated with writings termed "Christian apologetics", which was the defense of Christianity back in the centuries when Christianity was still a minority religion.
On this site it usually refers to people who defend the doctrines, lifestyles, teachings, culture and principles of Jehovah's Witnesses. There is nothing intrinsically judgmental about calling someone an apologist, but on this site you may have noticed that JW apologists are in the minority.
What other terms were you having problems with? I haven't followed all the threads you've posted on so I'm not sure if these have been answered
"Dub" or "Dubbie" is short for JW (the W part, like George W Bush was nicknamed "Dubya".) That's not an "apostate" term - even when I was a Dub we called ourselves Dubs for short.
R&F Witness means "rank & file" - ordinary Witnesses as opposed to the policy-makers in Brooklyn.
The only thing I can't share with you is the secret apostate handshake. You have to drink three beers and then exchange blood with an apostate at an apostafest before that can be revealed to you.