building block vs plinth

building block

noun
  • A component that is part of a larger construction, such as a brick or a stone. 

  • A block made of wood or plastic that is used as a children's toy and can be stacked or joined to form a larger structure. 

  • A component that is part of a larger system. 

plinth

noun
  • The bottom course of stones or bricks supporting a wall. 

  • A base or pedestal beneath a cabinet. 

  • A block or slab upon which a column, pedestal, statue or other structure is based. 

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