imberb vs pubescent

imberb

adj

  • Beardless. 

pubescent

adj

  • Covered with down or fine hairs. 

  • At or just after the age of puberty. 

noun

  • An individual who is going through puberty. 

  • Synonym: See Thesaurus:pubescent 

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