asylum vs safe house

asylum and safe house both are nouns.

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

As nouns, safe house is a hyponym of asylum; that is, safe house is a word with a more specific, narrower meaning than asylum:

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

Other hyponyms of asylum include harbor, harbour, safehold.

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