Word Study
air lock
THESAURUS
air lock
aboideau, access, adit, approach, corridor, dock gate, entrance, entranceway, entry, entryway, flood-hatch, floodgate, gangplank, gangway, gate, hall, head gate, in, ingress, inlet, intake, lock, lock gate, means of access, opening, passage, passageway, penstock, sluice, sluice gate, tide gate, vestibule, water gate, way, way in, weirFor further exploring for "air lock" in Webster Dictionary Online