safe house vs asylum

safe house and asylum both are nouns.

Word	Noun	Adjective	Verb	Adverb
safe house	Yes	No	No	No
asylum	Yes	No	No	No

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

safe house: a house used as a hiding place or refuge by members of certain organizations
asylum: a shelter from danger or hardship

Other hypernyms of safe house include house, refuge, sanctuary.

safe house (noun)	asylum (noun)
a house used as a hiding place or refuge by members of certain organizations	a hospital for mentally incompetent or unbalanced person
	a shelter from danger or hardship