walk-in vs walk-up

walk-in

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

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

  • 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. 

walk-up

noun
  • A customer who arrives without a reservation; a walk-in. 

  • An informal visit to a control tower by a pilot, typically used as part of pilot training. 

  • An indoor or outdoor stand where food is sold to the public. 

  • An apartment or block with stairs rather than an elevator. 

  • A mountain that can be climbed without specialist equipment. 

  • Colaptes auratus, northern flicker. 

adj
  • For which no appointment is necessary. 

  • Containing such flats. 

  • Reached by stairs rather than an elevator. 

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