sanctuary vs safe house

sanctuary and safe house both are nouns.

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

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

sanctuary: 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 sanctuary include harbor, harbour, safehold.

sanctuary (noun)	safe house (noun)
area around the altar of a church for the clergy and choir; often enclosed by a lattice or railing	a house used as a hiding place or refuge by members of certain organizations
a shelter from danger or hardship
a consecrated place where sacred objects are kept