Ishmaelite vs raghead

Ishmaelite

noun
  • An Arab Muslim. 

  • An outcast. 

  • Any descendant of Ishmael. 

raghead

noun
  • A Muslim, Arab, Hindu, Sikh, Indian or member of any group that traditionally wears a headdress such as a turban, keffiyeh or headscarf. 

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