Balsa
Part of speech: noun
Definition: A large tree, Ochroma lagopus, native to tropical America, with wood that is very light in weight. The wood of this tree. A raft or float, used principally on the Pacific coast of South America.
Plywood
Part of speech: noun
Definition: Construction material supplied in sheets, and made of three or more layers of wood veneer glued together, laid up with alternating layers having their grain perpendicular to each other.A specific grade or type of this construction material.