humectant vs pomade

humectant

noun
  • Any substance that promotes the retention of water, especially one used to keep a food product moist. 

pomade

noun
  • A greasy or waxy substance that is used to style hair, making it look slick and shiny. 

verb
  • To anoint with pomade; to use pomade to style (hair). 

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