First of all, to to those that don't know much about taxonomy, this is how everything works together. Taxonomy is scientists' method of ordering all living things. The taxonomic groups go in this order: kingdom, phylum, class, order, family, genus, and species name.
Species: Cuniculus (domestic rabbit)
Rabbits belong to the order Lagomorpha, and rodents belong to the order Rodentia. The name Lagomorpha comes from the Latin word lagosmeaning "hare", and morphe meaning "form". The order has only two families: Leporidae (rabbits and hares), and Ochotonidae (pikas).
Just for reference here is what a guinea pig is
Species: Cavia porcellus