coz vs cuz

coz

conj

  • because 

noun

  • cousin (usually as a term of address) 

cuz

conj

  • because 

noun

  • cousin (usually as a term of address, but not necessarily towards one's cousin) 

adv

  • because 

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