forest vs wood

forest and wood both are nouns.

As nouns, forest and wood are synonyms defined as:

forest and wood: the trees and other plants in a large densely wooded area

Other synonyms of forest include woods.

forest (noun)	wood (noun)
the trees and other plants in a large densely wooded area	the hard fibrous lignified substance under the bark of trees
land that is covered with trees and shrubs	the trees and other plants in a large densely wooded area
	any wind instrument other than the brass instruments
	a golf club with a long shaft used to hit long shots; originally made with a wooden head

forest (verb)	wood (verb)
establish a forest on previously unforested land