big vs little

big is not a noun while little is a noun.

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

big (noun)	little (noun)
	a small amount or duration

big (adjective)	little (adjective)
above average in size or number or quantity or magnitude or extent	low in stature; not tall; describing something or someone with a stature less than normal
conspicuous in position or importance	limited or below average in number or quantity or magnitude or extent
given or giving freely	(quantifier used with mass nouns) small in quantity or degree; not much or almost none or (with `a') at least some
generous and understanding and tolerant	small in a way that arouses feelings (of tenderness or its opposite depending on the context)
marked by intense physical force	lowercase
significant	(of a voice) faint
prodigious	(informal) small and of little importance
serious or severe	(of children and animals) young, immature
loud and firm
(of animals) fully developed
in an advanced stage of pregnancy
feeling self-importance
exhibiting self-importance