What kind of word part is "-aceous," as in "herbaceous" or "cretaceous"?

Which personification of the U.S. government is said to be an extension of the initials "U.S."? The island of Tobago forms a Caribbean nation together with which larger island? Which former Beatle formed the band Wings in 1971? What name is given to the temperature of -273.15 degrees Celsius? Which 1970s TV cop show starred Paul Michael Glaser and David Soul as detectives driving a red Ford Gran Torino? Which singer led the Crickets on hits like "That'll Be the Day" and "Peggy Sue"? Which funk and R&B band had hits with "Jungle Boogie" and "Celebration"? Which soul singer was backed by the Pips on the 1973 hit "Midnight Train to Georgia"?