forest vs re-afforest

forest is a noun but re-afforest is not a noun.

Word	Noun	Adjective	Verb	Adverb
forest	Yes	No	Yes	No
re-afforest	No	No	Yes	No

As verbs, re-afforest is a hyponym of forest; that is, re-afforest is a word with a more specific, narrower meaning than forest:

Other hyponyms of forest include reforest.

forest (noun)	re-afforest (noun)
the trees and other plants in a large densely wooded area
land that is covered with trees and shrubs

forest (verb)	re-afforest (verb)
establish a forest on previously unforested land	reestablish a forest after clear-cutting or fire, etc.