becuz vs whilom

becuz

conj

  • because 

whilom

conj

  • During the same time that; while. 

  • Up to the time that; till, until. 

adv

  • At some time in the past; formerly, once upon a time. 

adj

  • At some time in the past; former, sometime. 

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