Moslem vs towelhead

Moslem

noun
  • Dated spelling of Muslim. 

adj
  • Dated spelling of Muslim. 

towelhead

noun
  • A member of the Muslims, Arabs, Sikhs, and other groups that traditionally wear headdress such as a turban and keffiyeh or headscarf. 

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