vane vs vexillum

vane

noun
  • The flattened, web-like part of a feather, consisting of a series of barbs on either side of the shaft. 

  • Any of several usually relatively thin, rigid, flat, or sometimes curved surfaces radially mounted along an axis, as a blade in a turbine or a sail on a windmill, that is turned by or used to turn a fluid. 

  • A sight on a sextant or compass. 

  • One of the metal guidance or stabilizing fins attached to the tail of a bomb or other missile. 

  • A weather vane. 

vexillum

noun
  • The rhachis and web of a feather taken together. 

  • A company of troops serving under one standard. 

  • A flag, banner, or standard. 

  • The upper petal of a papilionaceous flower. 

  • The sign of the cross. 

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