house of prayer vs building

house of prayer and building both are nouns.

Word	Noun	Adjective	Verb	Adverb
house of prayer	Yes	No	No	No
building	Yes	No	No	No

As nouns, building is a hypernym of house of prayer; that is, building is a word with a broader meaning than house of prayer:

house of prayer: any building where congregations gather for prayer
building: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of house of prayer include edifice.

house of prayer (noun)	building (noun)
any building where congregations gather for prayer	the act of constructing something
	the commercial activity involved in repairing old structures or constructing new ones
	a structure that has a roof and walls and stands more or less permanently in one place
	the occupants of a building