dome vs stadium

dome and stadium both are nouns.

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

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

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

dome (noun)	stadium (noun)
a hemispherical roof	a large structure for open-air sports or entertainments
a stadium that has a roof
informal terms for a human head
a concave shape whose distinguishing characteristic is that the concavity faces downward