“Autarkic” or “Autarky” should remind you of “Autonomy”-the right or condition of self-government. The idea of autarky may be thought of as an extension of autonomy.
Expand “Agit-Prop” as agitating propaganda which is used to incite people to take some action. It may be for winning an election or stirring up a revolution.
“Bodacious” should remind of someone with a great body, an athletic physique who looks attractive.
“Gerontocracy” should remind us of our great grandfathers who, as was the norm, liked to dictate the way how their successive generations should lead their lives.
“Plaudits” should remind you of “Pundits” (experts) who are praised for their knowledge and wisdom by their followers.
The “Approb-” part of “Approbation” should remind you of the word “Approval”. Easy, isn’t it?
“Gargantuan” should remind you of a giant who gorges on a huge amount of food. Remember thus!
The “-go-” part in Ergomania should remind you of someone who is always raring to go, someone who cannot sit still at one place but keep on going, keep on moving forward.
“Oniomania” should remind you of someone who is obsessed with owning things.
“Megalomaniac” should remind you of Megawatt and watt is the S.I. unit of Power. Thus, megawatt refers to mega power.