extensive vs big

extensive and big both are adjectives.

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

extensive (adjective)	big (adjective)
of agriculture; increasing productivity by using large areas with minimal outlay and labor	above average in size or number or quantity or magnitude or extent
broad in scope or content	conspicuous in position or importance
large in spatial extent or range or scope or quantity	given or giving freely
	generous and understanding and tolerant
	marked by intense physical force
	significant
	prodigious
	serious or severe
	loud and firm
	(of animals) fully developed
	in an advanced stage of pregnancy
	feeling self-importance
	exhibiting self-importance