(Blacks Law Dictionary)

Police 		The governmental department charged with;
 				the preservation of public order, 
				the promotion of public safety, and 
				the prevention and detection of crime

Police Officer	A peace officer responsible for;
				preserving public order,
				promoting public safety, and
 				preventing and detecting crime

Peace Officer	 A civil officer (such as a sheriff or police officer) appointed to 				maintain public tranquility and order.

Civil Law		ROMAN LAW. 
 			The body of law imposed by the state, as apposed to moral law.
 			The law of civil or private rights, as apposed to criminal law... 

Criminal Law	The body of law defining offences against the community at large
			regulating how suspects are;
				investigated,
				charged, and
				tried,
			and establishing punishments for convicted offenders

Common Law	1.The body of law derived from judicial decisions, 
 			rather than statutes or constitutions; CASELAW	
			2.The body of law based on the ENGLISH legal system, 
 			as distinct from a civil-law system
			Has two classes of crime: 
				serious crime or felonies, and
				minor crimes or misdemeanours 

Crime		A social harm that the law makes punishable;
			
Society		A community of people, as of a state, nation, or locality, with 				common cultures, traditions and interests.
 			An association or company of persons (usually unincorporated) 			united by mutual consent, to
				deliberate, 
				determine, and
				act jointly for a common purpose