Ricard, Herbsaint, or anisette are all substitutes for Pernod. Pernod is a brand of pastis, a licorice-flavored liqueur. Ricard is also a brand of pastis.
Pastis is a licorice-flavored liqueur that the French serve with water. It has a higher alcohol content than other anise-flavored liqueurs such as anisette. Pernod and Ricard are common brands of pastis.
Herbsaint is an anise-flavored liqueur that it is not as sweet. It was developed in New Orleans as a substitute for absinthe. Anisette is also an anise-flavored liqueur, though it's sweeter than pastis or Herbsaint. The French liqueur is also lower in alcohol than most other liqueurs.