The word forest can also refer collectively to those trees. An area that's covered in trees can be described with the adjective forested. Less commonly, forest can be used as a verb meaning to cover an area with trees.

What's an adjective for forest?

sylvan, rustic, foresty, grovy, shady, wooded, woodsy, woody. foresting. present participle of forest.

Is its a noun or adjective?

In the sentence you read, the word “its” is a possessive adjective meaning “belonging to it.” And the “it” in this sentence is the group. Other possessive adjectives are words like “his, her, my, your, our and their.” These words appear before a noun, like most adjectives in English, and change the meaning of the noun.