Vivarium is fully land, an aquarium is fully aquatic, paludarium is land and water, riparium is aquatic but half filled and gives the appearance of land through clever planting of terrestrial and aquatic plants, Arboreal tanks simulate treetops and fully aerial environments for animals like tree frogs and snakes.
Vivarium's are generally not built with a glass or silicone of sufficient quality and thickness to stand permanent water pressure and often have a back or front slide door for easy access and cleaning.