safe house vs sanctuary

safe house and sanctuary both are nouns.

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

As nouns, sanctuary is a hypernym of safe house; that is, sanctuary 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
sanctuary: a shelter from danger or hardship

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

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