appertain vs become

appertain

verb
  • To belong to or be a part of, whether by right, nature, appointment, or custom; to relate to. 

  • To belong as a part, right, possession, attribute, etc. 

become

verb
  • To be proper for; to beseem. 

  • Of an adornment, piece of clothing etc.: to look attractive on (someone). 

  • To come about; happen; come into being; arise. 

  • begin to be; turn into. 

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