evolve vs expand

evolve

verb
  • To change; transform. 

  • Of a population, to acquire or develop (a trait) in the process of biological evolution. 

  • To give off (gas, such as oxygen or carbon dioxide during a reaction). 

  • To move in regular procession through a system. 

  • To come into being; develop. 

  • Of a trait, to develop within a population via biological evolution. 

  • Of a population, to change genetic composition over successive generations through the process of evolution. 

  • To cause something to change or transform. 

expand

verb
  • To change (something) from a smaller form or size to a larger one; to spread out or lay open. 

  • To become, by rewriting, a longer, yet equivalent sum of terms. 

  • To feel generous or optimistic. 

  • To multiply both the numerator and the denominator of a fraction by the same natural number yielding a fraction of equal value 

  • To change or grow from smaller to larger in form, number, or size. 

  • To rewrite (an expression) as a longer, yet equivalent sum of terms. 

  • To increase the extent, number, volume or scope of (something). 

  • To express (something) at length and/or in detail. 

  • To increase in extent, number, volume or scope. 

  • To speak or write at length or in detail. 

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