pier vs pillar

pier

noun
  • A rectangular pillar, or similar structure, that supports an arch, wall or roof, or the hinges of a gate. 

  • A structure supporting the junction between two spans of a bridge. 

  • A similar structure, especially at a seaside resort, used to provide entertainment. 

  • A raised platform built from the shore out over water, supported on piles; used to secure, or provide access to shipping; a jetty. 

pillar

noun
  • Something resembling such a structure. 

  • A portable ornamental column, formerly carried before a cardinal, as emblematic of his support to the church. 

  • A large post, often used as supporting architecture. 

  • The centre of the volta, ring, or manege ground, around which a horse turns. 

  • An essential part of something that provides support. 

  • The body from the hips over the core to the shoulders. 

verb
  • To provide with pillars or added strength as if from pillars. 

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