frock vs robe

frock

verb
  • To clothe (somebody) in a frock. 

  • To make (somebody) a cleric. 

  • To grant to an officer the title and uniform of a rank he will soon be promoted to. 

noun
  • An outer garment worn by priests and other clericals; a habit. 

  • A sailor's jersey. 

  • An undress regimental coat. 

  • A frog. 

  • A dress, a piece of clothing, which consists of a skirt and a cover for the upper body. 

robe

verb
  • To clothe; to dress. 

  • To put on official vestments. 

noun
  • A long loose outer garment, often signifying honorary stature. 

  • The skin of an animal, especially the bison, dressed with the fur on, and used as a wrap. 

  • A wardrobe, especially one built into a bedroom. 

  • The largest and strongest tobacco leaves. 

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