“Plenipotentiary” can be expanded as “Plenty Potential” which someone who has full power can easily claim to have!
“Minacious” should be very easy to remember as it sounds very close to its meaning “Menacing”.
“Sciolism” should remind you of someone who pretends to know a lot about “Socialism” but in reality cannot even spell it correctly let alone knowing other aspects of it.
If someone quite does you a favor, you re-quite him/her with a favor, you re-turn the favor. Remember thus!
“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.