entail vs involve

entail

verb
  • To imply, require, or invoke. 

  • To settle or fix inalienably on a person or thing, or on a person and his descendants or a certain line of descendants; -- said especially of an estate; to bestow as a heritage. 

noun
  • That which is entailed. 

  • An estate in fee entailed, or limited in descent to a particular class of issue. 

  • The rule by which the descent is fixed. 

involve

verb
  • To cause or engage (someone or something) to participate or to become connected or implicated. 

  • To take in; to gather in; to mingle, blend or merge. 

  • To comprise or include; to have as a related part. 

  • To complicate or make intricate. 

  • To envelop, enfold, entangle. 

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