suntan vs umber

suntan

noun
  • In humans a brown or darkened coloration of the skin caused by exposure to ultraviolet light. 

verb
  • To attempt to obtain a suntan. 

  • To obtain a suntan by exposure to ultraviolet light. 

umber

noun
  • A grayling. 

  • A dusky brown African wading bird (Scopus umbretta) allied to the shoebill and herons; a hamerkop. 

  • A brown clay, somewhat darker than ochre, which contains iron and manganese oxides. 

verb
  • To give a reddish-brown colour to. 

adj
  • Of a reddish brown colour, like that of the pigment. 

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