From Longman Dictionary of Contemporary Englishpasskeypass‧key /ˈpɑːs-kiː $ ˈpæs-/ noun [countable] DHa key that will open several different locks in a building
Examples from the Corpus
passkey• Well yes, but in those sorts of terms complementarity becomes a passkey which turns suspiciously many locks.• The night porter used a passkey for those rooms that were empty or where no-one answered.• Mauss bought the passkey back, thwarting the anarchists' plans. 