Synonyms for Jolly roger:

n.

Jolly Roger (noun)
pirate flag, black flag.
bunting, checkered flag, blue peter, ensign, flag, hammer and sickle, flagpole, mast, color. pirate flag (noun)
black flag.

Other synonyms:

flagpole, checkered flag, hammer and sickle, blue peter, bunting. mast, flag. ensign. color.