vault vs walk-in

vault

noun
  • The secure room or rooms in or below a bank used to store currency and other valuables; similar rooms in other settings. 

  • A piece of apparatus used for performing jumps. 

  • Any cellar or underground storeroom. 

  • An arched masonry structure supporting and forming a ceiling, whether freestanding or forming part of a larger building. 

  • Any archive of past content. 

  • Any arched ceiling or roof. 

  • Anything resembling such a downward-facing concave structure, particularly the sky and caves. 

  • The space covered by an arched roof, particularly underground rooms and (Christianity, obsolete) church crypts. 

  • An encrypted digital archive. 

  • An act of vaulting, formerly (chiefly) by deer; a leap or jump. 

  • Any burial chamber, particularly those underground. 

  • An event or performance involving a vaulting horse. 

  • A gymnastic movement performed on this apparatus. 

  • Synonym of volte: a circular movement by the horse. 

verb
  • To jump or leap over. 

  • To build as, or cover with a vault. 

walk-in

noun
  • A relatively larger room or (especially) an apartment that is entered directly, not via an intervening passage or lobby. 

  • A demonstration or protest in which the participants assemble outside a facility, gain media exposure, and enter the facility in unison. 

  • A relatively small room (such as a closet or pantry) or refrigerator or freezer that is spacious enough to walk into. 

  • A customer, job applicant or similar who visits a restaurant, medical facility, car dealership, etc. without a reservation, appointment, or referral. 

  • A person whose original soul has departed the body and been replaced with another. 

  • A facility or an event that principally handles customers who do not have an appointment. 

  • A defector (or similar) who walks into an embassy (etc) unannounced. 

  • A facility accessed on foot rather than by car, usually contrasted to drive-in. 

adj
  • Accessed by walking, either exclusively, as a campground, or together with drive-in access, as at some drive-in movie theaters. 

  • Gaining access through unlocked doors. 

  • Designed to be possible to walk into (without stepping over a ledge, etc). 

  • That people may enter without a prior appointment. 

  • Spacious enough to walk into. 

How often have the words vault and walk-in occurred in a corpus of books? (source: Google Ngram Viewer )