intensive vs extensive

intensive is a noun but extensive is not a noun.

Word	Noun	Adjective	Verb	Adverb
intensive	Yes	Yes	No	No
extensive	No	Yes	No	No

intensive (noun)	extensive (noun)
a modifier that has little meaning except to intensify the meaning it modifies

intensive (adjective)	extensive (adjective)
of agriculture; intended to increase productivity of a fixed area by expending more capital and labor	of agriculture; increasing productivity by using large areas with minimal outlay and labor
tending to give force or emphasis	broad in scope or content
characterized by a high degree or intensity; often used as a combining form	large in spatial extent or range or scope or quantity