Answer:

OXYMORONS

AnswerCrossword Clue
OXYMORONSCivil war et al.
OXYMORONSDeafening silence and bittersweet
OXYMORONS"Jumbo shrimp," etc.
OXYMORONS"Guest host" and "solo concert"
OXYMORONS"Jumbo shrimp" and "paid volunteer," e.g.
OXYMORONSSeemingly self-contradictory figures of speech
OXYMORONSPassive-aggressive and the like