catafalque vs bier

catafalque and bier both are nouns.

Word	Noun	Adjective	Verb	Adverb
catafalque	Yes	No	No	No
bier	Yes	No	No	No

As nouns, bier is a hypernym of catafalque; that is, bier is a word with a broader meaning than catafalque:

catafalque: a decorated bier on which a coffin rests in state during a funeral
bier: a stand to support a corpse or a coffin prior to burial

catafalque (noun)	bier (noun)
a decorated bier on which a coffin rests in state during a funeral	a stand to support a corpse or a coffin prior to burial
	a coffin along with its stand