Thirty Years' War vs Rocroi

Thirty Years' War and Rocroi both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thirty Years' War	Yes	No	No	No
Rocroi	Yes	No	No	No

Thirty Years' War (noun)	Rocroi (noun)
a series of conflicts (1618-1648) between Protestants and Catholics starting in Germany and spreading until France and Denmark and Sweden were opposing the Holy Roman Empire and Spain	a battle in the Thirty Years' War (1643); the French defeated the Spanish invaders