buttress vs stele

buttress

noun
  • A brick or stone structure built against another structure to support it. 

  • Anything that supports or strengthens. 

  • A buttress-root. 

  • Anything that serves to support something; a prop. 

  • A feature jutting prominently out from a mountain or rock. 

verb
  • To support something or someone by supplying evidence. 

  • To support something physically with, or as if with, a prop or buttress. 

stele

noun
  • An upright (or formerly upright) slab containing engraved or painted decorations or inscriptions; a stela. 

  • The central core of a plant's root and stem system, especially including the vascular tissue and developed from the plerome. 

  • Any carved or engraved surface. 

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