KGB (Russian secret police)

sit-up

a- (not; without)

(rare) dog / (figurative) mischievous person

(obsolete) Alternative form of bada (“rhinoceros”)

Initialism of primeiro-ministro.

pseudo- (not genuine)

(computing) abort (function used to abort a process)

quiz (question-answering competition)

free / unoccupied / clear, open