pressure dome vs dome

pressure dome and dome both are nouns.

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

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

pressure dome (noun)	dome (noun)
a dome-shaped building that is pressurized	a hemispherical roof
	a stadium that has a roof
	informal terms for a human head
	a concave shape whose distinguishing characteristic is that the concavity faces downward