agnate vs synonymous

agnate

adj
  • Having a similar semantic meaning. 

  • allied; akin 

  • Related to someone by male connections or on the paternal side of the family. 

noun
  • A relative whose relation is traced only through male members of the family. 

  • A statement having a similar meaning to another, but a different structure. 

  • Any paternal male relative. 

synonymous

adj
  • Having a similar meaning. 

  • Having an identical meaning. 

  • Such that both its forms yield the same sequenced protein. 

  • Of, or being a synonym. 

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