become vs behoove

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. 

behoove

verb
  • To befit, be appropriate or necessary to somebody. Alternative form of behove. 

  • To be fitting. 

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