big vs extensive

big and extensive both are adjectives.

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

big (adjective)	extensive (adjective)
above average in size or number or quantity or magnitude or extent	of agriculture; increasing productivity by using large areas with minimal outlay and labor
conspicuous in position or importance	broad in scope or content
given or giving freely	large in spatial extent or range or scope or quantity
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