big vs voluminous

big and voluminous both are adjectives.

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

big (adjective)	voluminous (adjective)
above average in size or number or quantity or magnitude or extent	large in number or quantity (especially of discourse)
conspicuous in position or importance	marked by repeated turns and bends
given or giving freely	large in volume or bulk
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