fillip vs strengthener

fillip

noun
  • Something that excites or stimulates. 

  • A sharp strike or tap made using this action, or (by extension) by other means. 

  • Something unimportant, a trifle; also, the brief time it takes to flick one's finger (see noun sense 1); a jiffy. 

verb
  • To project quickly; to snap. 

  • To strike or tap smartly. 

  • To drive as if by a fillip (noun sense 1); to excite, stimulate, whet. 

  • To strike, project, or propel with a fillip (that is, a finger released quickly after being pressed against the thumb); to flick. 

  • To make a fillip (noun sense 1) (with the fingers). 

strengthener

noun
  • One who, or that which, gives or adds strength. 

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