citizenship vs manumission

citizenship

noun
  • The state of being a citizen, in its various senses. 

  • The status of being a citizen, in its various senses. 

manumission

noun
  • Release from slavery or other legally sanctioned servitude; the giving of freedom; the act of manumitting. 

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