early vs precocious

early and precocious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
early	No	Yes	No	Yes
precocious	No	Yes	No	No

early (adjective)	precocious (adjective)
at or near the beginning of a period of time or course of events or before the usual or expected time	characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude)
of an early stage in the development of a language or literature	appearing or developing early
being or occurring at an early stage of development
belonging to the distant past
very young
expected in the near future

early (adverb)	precocious (adverb)
before the usual time or the time expected
during an early stage
in good time