allow vs alter

allow

verb
  • To render physically possible. 

  • To not bar or obstruct. 

  • To grant, give, admit, accord, afford, or yield; to let one have. 

  • To acknowledge; to accept as true; to concede; to accede to an opinion. 

  • To grant license to; to permit; to consent to. 

  • To grant (something) as a deduction or an addition; especially to abate or deduct. 

  • To take into account by making an allowance. 

  • To decide (a request) in favour of the party who raised it; to grant victory to a party regarding (a request). 

alter

verb
  • To tailor clothes to make them fit. 

  • To castrate, neuter or spay (a dog or other animal). 

  • To change the form or structure of. 

  • To become different. 

  • To affect mentally, as by psychotropic drugs or illness. 

noun
  • An identity or headmate of a person with dissociative identity disorder (previously known as multiple personality disorder). A member of a system. 

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