park vs stadium

park and stadium both are nouns.

Word	Noun	Adjective	Verb	Adverb
park	Yes	No	Yes	No
stadium	Yes	No	No	No

As nouns, stadium is a hypernym of park; that is, stadium is a word with a broader meaning than park:

Other hypernyms of park include arena, bowl, sports stadium.

park (noun)	stadium (noun)
a facility in which ball games are played (especially baseball games)	a large structure for open-air sports or entertainments
a gear position that acts as a parking brake
a large area of land preserved in its natural state as public property
a piece of open land for recreational use in an urban area
a lot where cars are parked

park (verb)	stadium (verb)
place temporarily
maneuver a vehicle into a parking space