competence vs effectivity

competence

noun
  • The quality or state of being competent, i.e. able or suitable for a general role. 

  • The quality or state of being able or suitable for a particular task; the quality or state of being competent for a particular task or skill. 

  • The system of linguistic knowledge possessed by native speakers of a language, as opposed to its actual use in concrete situations (performance), cf. linguistic competence. 

  • the legal authority to deal with a matter. 

  • The degree to which a rock is resistant to deformation or flow. 

effectivity

noun
  • The ability or power to be effective. 

  • [Technical documentation] An indication of the product, procedure, or timescale for which an item of information is applicable or effective. 

  • A measure of the effectiveness of something. 

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