interior vs outward

interior

noun
  • The set of all interior points of a set. 

  • The inside regions of a country, distanced from the borders or coasts. 

  • The inside of a building, container, cavern, or other enclosed structure. 

adj
  • Within any limits, enclosure, or substance; inside; internal; inner. 

  • Remote from the limits, frontier, or shore; inland. 

outward

adv
  • Towards the outside; away from the centre. 

adj
  • visible, noticeable 

  • outer; located towards the outside 

  • Tending to the exterior or outside. 

noun
  • A ward in a detached building connected with a hospital. 

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