biological mother vs mom

biological mother

noun

  • The woman from whom one inherits half of one's DNA and who is the source of one's mitochondrial DNA. 

mom

noun

  • Mother. 

  • An adult female owner of a pet. 

verb

  • To care for in a motherly way. 

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