The term "twoseater" refers to a vehicle or furniture that can accommodate two people. Some similar words for this concept include "two-person," "couple's," "double," "tandem," and "duo." These words can be used as adjectives to describe the capacity of a particular item, such as a two-person couch or a tandem bike. Other words that can be used to describe the same concept include "biplace," "double-seater," and "dual occupancy." Whether you're talking about a car, bike, or piece of furniture, there are plenty of words that can be used to describe its capacity for two people.