earlier vs originally

earlier is an adjective but originally is not an adjective.

Word	Noun	Adjective	Verb	Adverb
earlier	No	Yes	No	Yes
originally	No	No	No	Yes

As adverbs, earlier and originally are synonyms defined as:

Other synonyms of earlier include in the beginning, in the first place, to begin with.

earlier (adjective)	originally (adjective)
(comparative and superlative of `early') more early than; most early

earlier (adverb)	originally (adverb)
earlier in time; previously	in an manner suggesting originality
comparatives of `soon' or `early'	with reference to the origin or beginning
before now	before now