What is the difference between criminal negligence and manslaughter in US law?

Criminal Negligence is a term covering a wide scope in criminal law as every criminal act involves criminal intention or criminal negligence which is usually referred as term "mens rea" and specifically in case of an offence causing death it greatly matters as by the intention or negligence it can be vary to Murder, Homicide. or Manslaughter

This distinction is sound as per the classification of its practical application which varies from case to case, The criminal negligence becomes manslaughter as the negligence is of so intense in nature and serious recklessness can be judged by applying reasonable man test.