sprout vs substratum

sprout

noun
  • An edible germinated seed. 

  • A child. 

  • A Brussels sprout. 

  • A bean sprout. 

  • A new growth on a plant, whether from seed or other parts. 

verb
  • To emerge from the ground as sprouts. 

  • To emerge haphazardly from a surface. 

  • To emerge or appear haphazardly 

  • To cause to grow from a seed. 

  • To deprive of sprouts. 

  • To grow from seed; to germinate. 

substratum

noun
  • A substrate. 

  • The underlying cause or basis of something. 

  • A layer that lies underneath another. 

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