signal box vs edifice

signal box and edifice both are nouns.

Word	Noun	Adjective	Verb	Adverb
signal box	Yes	No	No	No
edifice	Yes	No	No	No

As nouns, edifice is a hypernym of signal box; that is, edifice is a word with a broader meaning than signal box:

signal box: a building from which signals are sent to control the movements of railway trains
edifice: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of signal box include building.

signal box (noun)	edifice (noun)
a building from which signals are sent to control the movements of railway trains	a structure that has a roof and walls and stands more or less permanently in one place