funeral church vs dead room

funeral church and dead room both are nouns.

Word	Noun	Adjective	Verb	Adverb
funeral church	Yes	No	No	No
dead room	Yes	No	No	No

As nouns, dead room is a hypernym of funeral church; that is, dead room is a word with a broader meaning than funeral church:

funeral church: a mortuary where those who knew the deceased can come to pay their last respects
dead room: a building (or room) where dead bodies are kept before burial or cremation

Other hypernyms of funeral church include morgue, mortuary.

funeral church (noun)	dead room (noun)
a mortuary where those who knew the deceased can come to pay their last respects	a building (or room) where dead bodies are kept before burial or cremation