in the beginning vs originally

in the beginning and originally both are adverbs.

Word	Noun	Adjective	Verb	Adverb
in the beginning	No	No	No	Yes
originally	No	No	No	Yes

As adverbs, in the beginning and originally are synonyms defined as:

in the beginning and originally: with reference to the origin or beginning

Other synonyms of in the beginning include primitively.

As adverbs, in the beginning and originally are synonyms defined as:

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

in the beginning (adverb)	originally (adverb)
with reference to the origin or beginning	in an manner suggesting originality
before now	with reference to the origin or beginning
	before now