let in vs welcome

let in

verb
  • To let someone or something come in; to admit someone or something in. 

  • To associate with. 

  • To divulge one's inner thoughts to (someone), making oneself emotionally vulnerable to them; to open up to (someone). 

welcome

verb
  • To accept something willingly or gladly. 

  • To affirm or greet the arrival of someone, especially by saying "Welcome!". 

noun
  • The utterance of such a greeting. 

  • The act of greeting someone’s arrival, especially by saying "Welcome!"; reception. 

  • Kind reception of a guest or newcomer. 

  • The state of being a welcome guest. 

adj
  • Whose arrival is a cause of joy; received with gladness; admitted willingly to the house, entertainment, or company. 

  • Producing gladness. 

  • Free to have or enjoy gratuitously. 

intj
  • Greeting given upon someone's arrival. 

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