ascendancy vs precellence

ascendancy

noun
  • A class of Protestant landowners and professionals that dominated political and social life in Ireland up to the early 20th century 

  • Supremacy; dominant control; the quality of being in the ascendant. 

  • A quantitative attribute of an ecosystem, defined as a function of the ecosystem's trophic network, and intended to indicate its ability to prevail against disturbance by virtue of its combined organization and size. 

precellence

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