phylum vs tribus

phylum

noun
  • A large division of possibly related languages, or a major language family which is not subordinate to another. 

  • A rank in the classification of organisms, below kingdom and above class; also called a divisio or a division, especially in describing plants; a taxon at that rank 

tribus

noun
  • Synonym of tribe 

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