sanctuary (noun) – a place of safety, refuge, or protection; a state of asylum; a consecrated area
BREAKDOWN: SANCT- (sacred or holy) + -ARY (place of)
This word is built on the root SANCT-, which means sacred or holy.
Common SANCT- words include include saint and sanctuary.
More esoteric SANCT- words include sanctificate, sanctity, and sanctiloquence.