What two-word term is used for a hired underworld assassin?

What two-word name was used for the communist regime that brutally ruled Cambodia in the 1970s? What two-word nickname was given to Florida's electric chair, built by inmates in 1923? What two-word slang name refers to Australia, the smallest continent? Which giant relative of the dugong and manatee, found in the Bering Sea in 1741, was hunted to extinction by about 1768? Which two-word term describes a little-known long-shot candidate who wins a nomination, as James K. Polk did in 1844? What two-word term describes a small gift tucked into a Christmas stocking? What two-word term names the soft, fluffy pad used to dab makeup onto the face? What two-word term, common in Britain, means a tuxedo?