body hair vs vellus hair

body hair

noun
  • An individual strand of such hair. 

  • Hair of the body; in particular, androgenic hair, to the exclusion of facial hair and the hair atop one's head. 

vellus hair

noun
  • An individual strand of vellus hair 

  • Short, fine, light-colored, and barely noticeable hair that develops on most of a person's body from his/her childhood. 

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