enforcer vs sergeant

enforcer

noun
  • One who enforces. 

  • The member of a group, especially of a gang, charged with keeping dissident members obedient. 

  • A hired strongman, especially working for the underworld. 

  • A player who physically intimidates or confronts the opposition. 

sergeant

noun
  • A bailiff. 

  • A fish, the cobia. 

  • A title sometimes given to the servants of the sovereign. 

  • The highest rank of noncommissioned officer in some non-naval military forces and police. 

  • UK army rank with NATO code OR-6, senior to corporal and junior to warrant officer ranks. 

  • Any of various nymphalid butterflies of the genus Athyma; distinguished from the false sergeants. 

  • A lawyer of the highest rank, equivalent to the doctor of civil law. 

  • A servant in monastic offices. 

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