galactose vs maltose

galactose

noun
  • A monosaccharide found, along with lactose, in dairy products, and is synthesized by the body where it is found associated with glycolipids and glycoproteins. 

maltose

noun
  • A disaccharide, C₁₂H₂₂O₁₁ formed from the digestion of starch by amylase; is converted to glucose by maltase; it is an isomer of trehalose 

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