fill out vs maturate

fill out

verb
  • To have one's physique expand with maturity or with surplus weight. 

  • To complete a form or questionnaire with requested information. 

maturate

verb
  • To bring to ripeness or maturity; to ripen. 

  • To undergo perfect suppuration. 

  • To promote the perfect suppuration of (an abscess). 

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