little vs big

little is a noun but big is not a noun.

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

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

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