adoptive father vs fatha

adoptive father

noun
  • A man who has adopted a child, as opposed to a biological father. 

fatha

noun
  • father 

  • The vowel designated by this mark. 

  • In Arabic script, the vowel point for a, appearing as a diagonal line placed above a letter ( ـَ ) and designating a short a /a/. If the Arabic letters ا (أَلِف (ʔalif)) or ى (أَلِف مَقْصُورَة (ʔalif maqṣūra)) immediately follow, it indicates a long ā /aː/. 

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